NZR JA class
JA 1271 with excursion consist climbing the Opapa incline
The NZR JA class were a type of 4-8-2 steam locomotive used on the New Zealand railway network. The class was built in two batches, with the second batch possessing some differences from the first. The first batch was built at Hillside Workshops in 1946–56 and the second batch by the North British Locomotive Works in 1951. To distinguish between the batches, locomotives are identified by their maker.
The JA class was the last class of steam locomotive built both for and by NZR – Hillside JA 1274 was the last steam locomotive ever built by NZR, and the North British JAs were the last steam locomotives built overseas for the NZR.
The class had relatively short lives of between 12 and 24 years, as they succumbed to dieselisation. Nine JAs lasted until the end of steam on 26 October 1971.
Hillside JA of 1946
The class were an improved version of the J class locomotives. Unlike the J class, which were built overseas by the North British Locomotive Company in Glasgow, Scotland, the new class were instead constructed by NZR's Hillside Workshops in Dunedin. However, much of the components, such as the bar frames, were still sourced from North British  as Hillside lacked the means to construct such a frame.
Some of the more notable improvements from the J class were the use of the Westinghouse cross-compound pump; Ashton double pressure gauge; the Sellars injector in the cab; steam for the pump was taken from a manifold in the cab and not an outlet on the steam dome; combined gauges in the cab; and roller bearings on the driving and connecting rods. However, the first two JAs produced, No.'s 1242 and 1243, did not have roller bearings on any of the rods, and on the rest of the locomotives numbered in the 124X range, roller bearings were only present at the connection between the driving and connecting rods and not on the other wheels. The "all rolling bearing JA... 1265 to 1270" were assigned by Linwood locomotive depot to the South Island Limited wherever possible  between 1952 and 1968, the fastest being 'legendary' JA 1270, scrapped in mid 1969, requiring only minimal repair after running into an unaligned turntable pit. In most other respects however, the class was virtually identical to the earlier J class, although the JA class was never fitted with bullet-nose streamlining.
Although the first class member was built in 1946, the boilers for the last 10 Hillside JA plus two spare boilers were not delivered from North British until 1953. For this and a number of other factors, the last member of the class was not turned out of the workshops until December 1956. That last locomotive, JA 1274, was both the last steam locomotive built for, and by, NZR. The class was intended for the far more extensive fast passenger trains that existed in the South Island before the introduction of Fiat railcars in 1956 and the transfer of passengers to air services.
The class only ever worked in the South Island during their NZR career. The first members operated out of Dunedin, although they were supposed to be allocated to Christchurch. When enough of the class were in service to displace the 4 members of the J class based out of Dunedin, those locomotives headed north to join the rest of their class in the North Island. The class performed their duties over most South Island lines, as far south as Bluff, although axle loading and gauge profile restricted there use on the North line to Picton, although some of their fastest running, over 60 mph was achieved on the night Cabbage Train, 111/112 in 1957-63  with 1-3 carriages and express goods, on the Christchurch Kaikoura sector  The JA was too big for long branch lines like Otago Central Railway or Kingston Branch. Despite this, the class became the mainstay of the South Island network. It excelled on the South Island Limited on the fairly flat, Invercargill-Dunedin section and particularly on the fast run across the Canterbury Plains between Christchurch and Oamaru, and the evening run back on 144 to Christchurch was legendary when late and racing to get to the Lyttelton-Wellington Ferry. Reliable footplate observers of the JA on the South Island limited during the late 1960s saw the speedometer over 75 miles per hour (121 km/h) and the train moving away rapidly from the traffic on State Highway One adjacent to the railway. Rail writer David Leitch, a Masterton Lawyer believed JA drivers account of 85 miles per hour (137 km/h) running as accurate. The maximum official speed was 100 kilometres per hour (62 mph), but the class operated effortlessly at high speed, especially across the Canterbury Plains. JA 1267 pulling ten carriages weighing 300 tons covered the 42 miles (68 km) from Tinwald to Washdyke at 59.4 miles per hour (95.6 km/h). The official NZR speed record of 125.5 kilometres per hour (78.0 mph) was set by a Vulcan RM class railcar, but the JA class unofficially operated at higher speeds. Another duty for the class was the Bluff school train, which ran from Bluff to Invercargill and back every school day until its replacement by buses in the mid-1960s. There were (and still are) no secondary schools in Bluff.
Withdrawal and disposal
The first of the class, JA 1249 and 1272 were not withdrawn until March 1968, in distinct contrast to the types J, JB and North British JA cousins. In 1966, 12 JA class members (and four J class) received a full overhaul, six in 1967 and two in 1968. Use of steam on freight on the East Coast of the South Island finished in March 1969, and 15 JAs and the three Js rebuilt with North Island JA tenders and trailing engine bogies were maintained for service. JA 1267 was the last steam engine given an A grade overhaul by NZR in November 1968, and with the last three Js provided one of the last high speed steam services in the world, between Christchurch and Oamaru. The JA class lasted in front-line duty until the end of steam in New Zealand; the South Island Limited was then worked by steam locomotives until replaced by the diesel Southerner in November 1970. It was also planned to dieselise the overnight Friday Sunday express with surplus steam heat vans when the North Island Limited was replaced by the Silver Star, but late delivery of the new train from Japan meant the services were steam hauled for another year until 26 October 1971. The locomotives remained ready for service into November but were never called upon.
Due to locomotives suffering mechanical defects or in need of repairs, they were often sidelined. Some, such as JA 1271, were used as stationary boilers. These locomotives, as was common practice at the time, were often stripped of parts to keep the rest of the fleet going.
North British JA of 1951
In 1950 it became clear additional motive power was required in the North Island, but the process of dieselisation was yet to begin. Consequently, NZR chose to order 16 steam locomotives from North British to the design of the successful J class. These locomotives contained a number of differences to both the J class and Hillside JAs – although turned out with the cross-compound pump, roller bearings on the rods were limited to the connection between the connecting and driving rod, mechanical lubrication was employed. In January 1951 the order had been made for the 16 JA to be more coal burners, and North British regarded the order as essentially a repeat order, virtually identical to 1939 J, but in April 1951 the NZR CME requested the order to be changed to oil burning due to perceived long term coal shortage due to the waterfront strike and the associated strike by miners and unavailability of shipping for coal and the expected long term high imported coal price and the long time it would take to build up coal stocks to safe levels, and the class were built as oil burners, with no grate, ash pan or fire door (the only class of locomotives on the NZR to be built completely as oil burners)and ACFL blow down was incorporated late in their construction. A significant improvement was the incorporation of French T.I.A, blow down equipment which enabled rapid ejection of boiler sludge  and reduced the boiler scale, enabling much faster turnaround and higher availability. The system of injection of the oil flow into the burners is different and far more effective than in NZR 1948-50 conversion of 12 Js to oil burning. Other detail differences was the use of Stone's headlights and electrical generator instead of the usual Pyle National equipment, the "Butterfly" number boards on the front headlight, and the lack of smokebox number plate (although a smokebox plate was specified by the NZR).
Captive to the North Island, the North British JAs operated on the routes most commonly worked by oil burning locomotives. "The North British JA's were fine clean lined machines, and extremely popular in the Auckland district where they were put to use on most tasks. They handled almost every express train in that area for a dozen years,"  The Auckland JA were very much specialized express engines and far more impressive express performers than the KA in the view of most Auckland engine drivers. The North Island JAs in their early years were the most efficient rail engines in New Zealand, and outclassed the early English Electric diesel locomotives and K class. However the rest of the steam fleet, other than the J and JB, suffered increased mechanical failure and repair costs, in moving the heavier post war traffic on the NIMT. By 1955 the K and X 4-8-2 classes were worn out, but 9 K were rebuilt with KA frames in 1955-57 as it unacceptable to write off the legendary K and retain useful Baldwin Aa. However the superiority of the DA and JA meant it was announced, a A overhaul of a K in 1961, was the last for the class, but sensitivity delayed bloc withdrawal till 1964. During the 1955-59 period the North Island JA matched the availability of the new DA class, each JA being available 252 days a year in the North Island, and achieving 82% of the DA mileage but the steam engines required biannually overhauls and fuel costs were 3 times that of the DA. The first eleven, JAs 1275–1285, were based in Auckland while the other five, JAs 1286–1290, dubbed the 'Forgotten Five' by enthusiasts – were based initially at Palmerston North before being moved to Napier in 1963. Had the North Island JA oil fired ever run in the South Island, it quite possible that they would have been capable of 100 miles per hour (160 km/h), as their efficient acceleration is unmatched among the J variants and the J rail classification is that of the fastest passenger engines.
The Auckland-based locomotives were regularly allocated to the North Auckland Line the Opua express till 1959 and the Helensville local till 1966 and the North Island Main Trunk services such as Auckland–Wellington, 227/626 Express (Mail) and faster Night Limited and Auckland–Wellington express goods Train 627. There are however accounts of them being used elsewhere, with accounts surviving of JA 1279 running on the Waiuku Branch in the early 1960s, and later on the Raetihi Branch during the same decade after coal-fired AB 700 caused several lineside fires. When working with other 4-8-2s on the NAL, they were required to have a bogie wagon such as a UB flat wagon between the two engines in order to distribute weight more evenly on the light bridges along that line.
The five Palmerston North-based engines by contrast were less frequently allocated to NIMT trains, instead running over the Marton - New Plymouth Line to Wanganui and the Palmerston North - Gisborne Line as far as Gisborne. They were considered to be harder working than their Auckland counterparts, which spent most of their time rostered to passenger services. By comparison, the Palmerston North-based JAs spent more time working freight trains, particularly with the arrival of the Drewry 'Twin-set' railcars.
Following the onset of dieselisation in the 1960s, the locomotives migrated to Frankton Junction. While JA 1286 was briefly transferred to Auckland in the mid-1960s, it was felt it did not perform as well as the eleven Auckland-based locomotives and was quickly re-allocated to Frankton. After this, the locomotives were largely relegated to the old East Coast Main Trunk Railway between Hamilton, Tauranga and Taneatua, again largely on freight trains due to the reduction of passenger services from Taneatua to Te Puke, which were now handled by the 'Twin-sets'.
Withdrawal and disposal
Despite being a very young class, some of the North British JA class members were among the first of the J types to be withdrawn. The first of the class to be withdrawn, JA 1279, was withdrawn in 1964 and sent to Hillside Workshops minus at least one driving wheelset, taken to repair JA 1275 after it suffered an axle fracture while passing through Mercer that year. The rest of the locomotive then became a source of spares for the J and Hillside JA class locomotives in the South Island, with the oil-fired boiler being converted to coal-firing before being fitted to Greymouth-based J 1212 during a C-grade overhaul.
As the North British JAs were withdrawn, most were stripped of parts to keep the South Island J and JA class locomotives running, along with the remaining North British JAs which by then were based out of Frankton Junction. Several of the tenders from JA 1287, 1288, 1290 locomotives, transferred south in November 1966, which were in relatively good condition, were rebuilt to accommodate a coal bunker in place of the fuel oil tank and attached to J class locomotives whose original 1939-built tenders were life-expired. Other parts of the surplus North Island JA were also refited,including the trailing trucks and approval was given to fit JA 1288 boiler. Most of the North Island JA were withdrawn too late in 1967 or early 1968, to be reprocessed, as A grade SI J overhauls had ceased with dieselisation.
Only three of the North British JA class managed to reach the end of North Island steam in 1968, JA 1275 being one of them. After withdrawal and removal of all useful parts, the North British JAs were onsold to Sims Pacific Metal Industries and towed as required to Sims-PMI's Otahuhu scrapyard, adjacent to the Otahuhu Workshops, for scrapping. The only locomotive to avoid this fate, JA 1275, was purchased by Les Hostick in 1968 and transported to the NZR&LS Waikato Branch's Te Awamutu Railway Museum along with BB 144 for static display.
Six of the Hillside JAs survived to be preserved; by contrast only one North British JA remains. Additionally, two preserved J class locomotives have North British JA tenders.
JA 1240 "Jessica" was preserved by Blenheim man Peter Coleman, and was stored serviceable at his Blenheim property. In 1988 after his death, JA 1240 was purchased by Ian Welch, and in 1990 travelled to the Mainline Steam Heritage Trust's Parnell depot. This locomotive's restoration for mainline use (as a coal burner) has been completed, and is based in Christchurch. It has been named after one of owner Ian Welch's granddaughters.
JA 1250 "Diana" was preserved by the Railway Enthusiasts Society for use on their Steam Safari train in 1972. After this series of excursions it was purchased by Phil Goldman, who named the engine after his wife, Diana. JA 1250 was restored by the Glenbrook Vintage Railway for use on their railway. In 1985, JA 1250 was one of two engines selected to be used on the first main line steam hauled trip since the end of steam. After this JA 1250 ventured around the country, being a notable attendee of the 1988 "Ferrymead 125" celebrations. Between 1994 and 1998 JA 1250 underwent a substantial overhaul, and returned to main line and GVR service. From 2006 JA 1250's main line certification lapsed, and it was confined to the Glenbrook Vintage Railway. In 2011 it was re-certified for main line running again, and made its debut back on the main line in spectacular fashion with a double header from Glenbrook to Hamilton with JA 1271.
JA 1260 was preserved by the Ashburton Railway and Preservation Society in May 1972. It saw limited use on the Plains Railway's line before a years lease to the Weka Pass Railway in 1986. After its return to Plains, it was dismantled for overhaul which was protracted due to other pressing projects. In 2007 work on this locomotive began at a fast pace, and in May 2008 JA 1260 was back in service on the railway. Notably JA 1260 is the only preserved member of the class to be operating at a lower boiler pressure of 180psi instead of 200psi - this reduction was made due to the limited nature of operations at The Plains Vintage Railway & Historical Museum.
JA 1267 was preserved by a syndicate and stored at the Te Awamutu Railway Museum at Te Awamutu, 1972. It sat on static display under a rudimentary shelter until 2008 when due to the winding up of the museum and dischord amongst the syndicate, the locomotive was placed up for auction. It was purchased by Ian Welch and transferred to the Mainline Steam Heritage Trust's Parnell depot where it is stored pending eventual overhaul to main line running.
JA 1271 was preserved by Reid McNaught and Russell Gibbard in 1978. At the time of purchase JA 1271 was incomplete and in a sorry state, having been used as a stationary boiler plant since 1970 after a motion failure. It was transferred to Steam Incorporated's Paekakariki base, and comprehensively restored to main line running. Its debut in 1997 kicked off with a tour of the South Island, before returning north where it has become a very active main line locomotive. It hauled the 2003 50th Anniversary Commemoration train of the Tangiwai disaster, and also was used prominently in the 100th Anniversary of the Parliamentary Special.
JA 1274 was preserved by the New Zealand Railway and Locomotive Society Otago branch in 1971, and in 1974 was placed on display in a specially erected sheter at the Otago Settlers Museum. It has remained on display there until 2011, when a new shelter was built for its display closer to the station building. There are no plans for restoration to working order for this locomotive.
North British JAs
JA 1275 was preserved by Les Hostick in 1967 and stored at the Te Awamutu Railway Museum at Te Awamutu, 1972. It sat on static display under a rudimentary shelter until 1994 when it was leased to Ian Welch and transferred to the Mainline Steam Heritage Trust's Parnell depot for restoration to main line running condition. Work began in 2001, and in 2004 JA 1275 returned to the main line rails. It has proven a reliable locomotive and sees frequent use on excursions.
|Key:||In service||On lease||Out of service||Preserved||Overhaul/Repair||Scrapped|
|1240||NZR Hillside Workshops||March 1947||16 November 1971||Preserved, Mainline Steam.|
|1241||NZR Hillside Workshops||March 1947||August 1968|
|1242||NZR Hillside Workshops||January 1947||June 1969||First Hillside JA to be built.|
|1243||NZR Hillside Workshops||March 1947||August 1968|
|1244||NZR Hillside Workshops||May 1947||March 1969|
|1245||NZR Hillside Workshops||August 1947||June 1969|
|1246||NZR Hillside Workshops||December 1947||May 1971|
|1247||NZR Hillside Workshops||January 1948||November 1969|
|1248||NZR Hillside Workshops||March 1948||13 July 1971|
|1249||NZR Hillside Workshops||July 1948||March 1968|
|1250||NZR Hillside Workshops||June 1949||16 November 1971||Preserved, Glenbrook Vintage Railway.|
|1251||NZR Hillside Workshops||August 1949||16 August 1971|
|1252||NZR Hillside Workshops||August 1949||16 August 1971|
|1253||NZR Hillside Workshops||November 1949||16 November 1971|
|1254||NZR Hillside Workshops||January 1950||June 1969|
|1255||NZR Hillside Workshops||March 1950||June 1969|
|1256||NZR Hillside Workshops||July 1951||16 November 1971||Boiler held by Mainline Steam.|
|1257||NZR Hillside Workshops||October 1951||16 August 1971|
|1258||NZR Hillside Workshops||December 1951||16 November 1971|
|1259||NZR Hillside Workshops||June 1952||June 1969|
|1260||NZR Hillside Workshops||November 1952||16 August 1971||Preserved, The Plains Railway.|
|1261||NZR Hillside Workshops||March 1953||16 November 1971|
|1262||NZR Hillside Workshops||November 1953||July 1969|
|1263||NZR Hillside Workshops||January 1954||July 1969|
|1264||NZR Hillside Workshops||July 1954||June 1969|
|1265||NZR Hillside Workshops||May 1950||June 1969|
|1266||NZR Hillside Workshops||July 1950||June 1969|
|1267||NZR Hillside Workshops||September 1950||16 November 1971||Preserved, Mainline Steam.|
|1268||NZR Hillside Workshops||November 1950||August 1968|
|1269||NZR Hillside Workshops||January 1955||June 1969|
|1270||NZR Hillside Workshops||December 1955||June 1969|
|1271||NZR Hillside Workshops||April 1956||16 November 1971||Preserved, Steam Incorporated. Mainline certified.|
|1272||NZR Hillside Workshops||August 1956||March 1968|
|1273||NZR Hillside Workshops||October 1956||July 1969|
|1274||NZR Hillside Workshops||December 1956||16 November 1971||Last steam locomotive to be built by the NZR. Preserved, Otago Settlers Museum.|
|1275||North British||19 July 1952||March 1968||Preserved, Mainline Steam. Mainline certified.|
|1276||North British||19 July 1952||March 1968|
|1277||North British||16 August 1952||May 1966|
|1278||North British||19 July 1952||March 1968|
|1279||North British||16 August 1952||July 1964|
|1280||North British||13 September 1952||May 1967|
|1281||North British||13 September 1952||September 1966|
|1282||North British||13 September 1952||November 1967|
|1283||North British||21 June 1952||March 1968|
|1284||North British||21 June 1952||August 1967|
|1285||North British||11 October 1952||October 1967|
|1286||North British||11 October 1952||November 1967|
|1287||North British||8 November 1952||October 1966|
|1288||North British||8 November 1952||September 1966|
|1289||North British||11 October 1952||February 1966|
|1290||North British||6 December 1952||October 1966|
- S.Miller. The NZR Steam Locomotive. NZ Railway& Locomotive Soc (2011)p 138
- M.Adams. Linwood Recollections. NZ Railway Observer 330, NZRLS, 4/5 May 2015, p. 16.
- Adams. Linwood Recollections & R.Gay. JA 1270 incident photo in NZRO Observers 328 and 330 (2015), p. 188 & 16.
- D.Spicer. Memories of the Cabbage Train-From the Cab. NZ Railway Observer 228, NZRLS 2/3 2014, p 228-9
- D.Spicer. Cabbage Train. NZ Railway Observer. 2/3/2014, p228-9,
- Ian Johnstone.'Total Steam'. DVD
- D. Leitch. Engine Pass, Reed. Auckland (1967),
- D.B. Leitch, NZ Railways. David & Charles. Newton Abbot, Devon (1972).
- A.Palmer & W.W. Stewart. Cavalcade of NZ Locomotives. A.H & A.W Reed.(1965)Wellington, p 123
- J.Cooke & J.Vogel. New Zealand. Steam Finale. Collins, (1979, p 127-8)
- (1) CME Binstead recommends JA order, changed to oil firing, increasing unit cost of each JA from 23,000 pound to 25,000 pounds.(2) Minister of Railways letter to High Commissioner London to change JA order to oil burners, 30 April 1951 and (3) CME J Binstead NZR outlines, reasons for JA order to be oil fired to UK agent and now no possibility of increasing the order beyond 16 JA, 44/712A, 16 May 1951
- A.N. Palmer & W.W.Stewart. Cavalcade of NZ Locomotives. A.H. & A.W. Reed. (1965) Wellington. p. 123.
- W.W.Stewart. When Steam was King. AH & AW Reed.(1970)Auckland, p56
- S. Miller. NZR. Steam Locomotives (2011),p211
- D. Leitch and B.Stott. NZ Railways, First 125 years. Heinmann Reed, Auckland (1988)
- "Ja Class 4-8-2 Register". Retrieved 29 October 2008.