British Rail Class 126

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British Rail Class 126
Glasgow Central Cravens split code end Class 126 and Class 107.jpg
In service 1957–1983
Manufacturer BR Swindon Works
Operator(s) British Rail
Specifications
Car length 64 ft 6 in (19.66 m)
Width 9 ft 3 in (2.82 m)
Height 12 ft 9 12 in (3.899 m)
Maximum speed 70 mph (113 km/h)
Weight 38 long tons (39 t; 43 short tons)
Prime mover(s) 150-horsepower (110 kW) BUT (AEC), 2 per power car
Power output 300 hp (220 kW)
Multiple working White Circle
Track gauge 4 ft 8 12 in (1,435 mm)

The British Rail Class 126 diesel multiple unit was built by BR Swindon Works in 1959/60 to work services from Glasgow to Ayrshire and comprised 22 Motor Second vehicles ( Sc51008-29), 22 Motor Brake Second ( Sc51030-51), 10 Kitchen Trailer First (59391-400) and 11 Trailer Composite (59402-59412) vehicles formed into 22 3-car sets formed Motor Second + Trailer + Motor Brake Second. These trainsets were based on the earlier Swindon-built trainsets that had been introduced in 1955 to work the Edinburgh Waverley - Glasgow Queen St services with vehicles numbered in the 79xxx series which formed the first Inter City service to be operated by diesel units in Great Britain. The introduction of these early diesel multiple units originated in a British Transport Commission report of 1952 that suggested the trial use of diesel railcars. BR's Swindon Works were chosen to design and build express units for the ex-North British Railway Edinburgh Waverley to Glasgow Queen Street route. There is much confusion with these early sets as the Class number (126) was allocated in the early 1970s when TOPS was introduced by British Railways but the imminent withdrawal of 79xxx numbered units meant that they were not reclassified thus Class 126 officially refers to only the 5xxxx series vehicles.

Description[edit]

The cars were of steel construction and featured Pullman gangways and buckeye couplings.[1] Each power car was fitted with two AEC 150 hp underfloor engines with mechanical transmission giving a maximum speed of 70 mph. Initially termed "Inter-urban", this was soon changed to "Inter-City" long before that branding was used for mainline express services.

These trains had two front-end designs: either a full-width cab or a half-cab with central gangway connection. The latter "intermediate" driving car allowed through access within a six-car set.[1] Neither end featured any destination blinds or marker lights, only a box holding a stencil indicating the train classification (A, B or C; later changed to 1, 2 or 3).[1] Power car seating was of the "open" saloon arrangement with compartment seating in the trailers. A unique multiple working control system (coded White Circle) was employed. Unlike other classes, each power car produced its own control air supply and was thus incompatible with any other.

The second batch was closely based on the 1956 stock. One big improvement was that the guard's van was moved to the rear of the coach giving passengers a forward view. Four-character headcode displays were fitted; the intermediate power cars having a two-character box either side of the gangway. Destination blinds and marker lights were not incorporated.

Operations[edit]

The first series (79xxx numbered) were introduced to Glasgow Queen St to Edinburgh Waverley services, including those operating via Falkirk Grahamston, in January 1957; the units were allocated to Leith Central depot following its conversion from the closed railway station in 1956. However, the first six three-car sets worked their first three years on Western Region on BirminghamSouth Wales services. There was criticism of the lack of a forward view for passengers and also of the plain "utility" appearance of the non-gangwayed cab front. The usual E. & G. formation was a six-car set with two trailers together in the centre of the train. The class usually stuck to this route but could appear on other services from time to time.

The second series (5xxxx numbered) were introduced on Ayrshire Coast services in August 1959 working services to Ayr and points south including Girvan and Stranraer and coastal services to Largs and Ardrossan. These units were allocated to Ayr and were operated as 3-car half sets combining to form a full 6-car trainset; the outer ends had full width windows whilst the inner ends had gangways with side windows and a side cab driving position.

The 1970s saw the first class accommodation downgraded. Being of a non-standard design, the class was not included in the DMU refurbishment programme so remained in close-to-original condition. The main alteration was the plating over of the outer gangway connection on the DMS vehicles in 1979–81 following drivers' complaints of draughts.

The original units (79xxx series) on the Edinburgh - Glasgow services were displaced by push-pull services powered by top 'n tail Class 27s in 1971 and all were withdrawn by 1972 except for four cars transferred to Ayr. The Ayrshire Coast stock fared rather better, surviving almost intact until mass withdrawals in the early 1980s. The last two units finally lost the fight in January 1983. Although used on various other routes out of Glasgow in their final years, these 126s remained closely identified with the Ayr line until displacement by a mixture of loco-hauled trains and other DMUs. Electrification meant that DMU operations on the Ayrshire routes finally ended in 1986 with the introduction of Class 318 EMUs.

Post-BR use[edit]

Five of the ex-E&G leading power cars were overhauled and exported to Liberia for use by LAMCO mining company for staff trains.[2]

BR Number LAMCO Number
79091 91
79093 93
79094 94
79096 96
79097 97

Preservation[edit]

Four vehicles (51017, 51043, 59404 & 79443) survive in preservation, owned by the Scottish Railway Preservation Society and based at the Bo'ness & Kinneil Railway. Three of these vehicles have been completely overhauled and are currently in Apple Green livery and the buffet car (79443) is currently undergoing restoration. They most recently featured at the 2011 Diesel Gala. Three others (59098, 59099 & 79441) went to heritage lines but have now been cut up for spares.

Numbering[edit]

1956 batch[edit]

Lot No. Type Diagram Quantity Fleet numbers Notes
30196 Driving Motor Brake Second (DMBSL) 550 9 79083–79090, 79095 Intermediate
30197 Trailer Corridor First Buffet (TFKRB) 560 8 79440–79447
30198 Trailer Corridor First (TFK) 570 13 79470–79482
30199 Driving Motor Second (DMSL) 551 14 79155–79168 Intermediate
30200 Driving Motor Brake Second (DMBSL) 552 20 79091–79094, 79096–79111 Leading

DMBS = 79083–79094 [ 3-car, 2 off ] + TRBF = 79440–79441 [ 3-car ] or TF = 79470–79473 [ 3 car ] forming 6 × 3-car sets[citation needed]

DMBS = 79095–79111 [ 3/6 car ] + DMS = 79155–79168 [ 3/6 car ] + TRBF = 79442–79447 [ 3/6 car ] + TF = 79474–79482 [ 3/6 car ] forming 5 × 6-car sets ( DMBS + DMS + TRBF + TF + DMS + DMBS ) + 3 × 3-car sets ( DMBS + TF + DMS ) + 4 spare vehicles ( DMBS + DMS + TRBF + TF )[citation needed]

1959 batch[edit]

Lot No. Type Diagram Quantity Fleet numbers Notes
30413 Driving Motor Second (DMSL) 551 23 50936, 51008–51029 Intermediate
30414 Driving Motor Brake Second (DMBSL) 608 22 51030–51051 Leading
30415 Trailer Corridor First (TFK) 570 10 59391–59400
30416 Trailer Corridor Composite (TCK) 571 11 59402–59412
30537 Trailer Corridor First Buffet (TFKRB) 560 2 59098–59099

References[edit]

  1. ^ a b c http://www.railbrit.co.uk/imageenlarge/imagecomplete2.php?id=30776
  2. ^ Fox, Peter; Hall, Peter (2001). Preserved Locomotives of British Railways (Tenth edition). Platform 5, Sheffield. ISBN 1-902336-20-8. 

External links[edit]