User:Hachijo8/MR250

Manila Railroad 250 class
Type and origin Power type Steam Designer H.K. Porter, Inc. Eddystone Arsenal Builder Baldwin Locomotive Works Order number 60515, 60540-42, 600581-84 Build date 1921-22 Total produced 8
Specifications Configuration: ​  • Whyte 2-8-2  • UIC 1'D1'h3P Gauge 3 ft 6 in (1,067 mm) Driver dia. 48 in (1,200 mm) Wheelbase ​  • Engine 27.58 ft (8.41 m)  • Drivers 13.25 ft (4.04 m) Adhesive weight 102,000 lb (46 t; 46,000 kg) Loco weight 143,000 lb (65 t; 65,000 kg) Tender weight 117,500 lb (53.3 t; 53,300 kg) Total weight 260,500 lb (118.2 t; 118,200 kg) Fuel type Coal, oil Fuel capacity 6,000 US gal (23,000 L) oil or 6 t (13,000 lb) coal Water cap. 6,000 US gal (23,000 L) Firebox: ​  • Type  • Grate area 32 sq ft (3.0 m2) Boiler pressure 180 psi (1,200 kPa) Heating surface: ​  • Firebox 176 sq ft (16.4 m2)  • Tubes 416 sq ft (38.6 m2)  • Flues 498 sq ft (46.3 m2)  • Tubes and flues 914 sq ft (84.9 m2)  • Total surface Superheater: ​  • Type Worthington No. 1 heater  • Heating area 435 sq ft (40.4 m2) Cylinders 3 Cylinder size 20 in (510 mm) diameter x 28 in (710 mm) stroke Valve gear Walschaerts Valve type Piston valves Couplers Buffers and chain coupler
Performance figures Maximum speed 53 mph (85 km/h) Power output 1,372 hp (1,023 kW) Tractive effort 42,840 lbf (190.6 kN) Factor of adh. 2.78
Career Operators Manila Railroad Company Number in class 8 Numbers 251-258 Locale Entire MRR network Delivered August 1928 First run 1929 Preserved 0 Scrapped c. 1945 Disposition Scrapped
References:

The Manila Railroad 250 class were eight 2-8-2 Mikado-type steam locomotives. They were built by Baldwin Locomotive Works in 1928 for the Manila Railroad, predecessor of the Philippine National Railways.

Background

See also: Manila Railroad 140 class

The early 1920s saw popular American manufacturers enter the Philippine market as part of the policy of the newly-reorganized Manila Railroad. Both H.K. Porter, Inc. and American Locomotive Company (Alco) built locomotives for the Manila Railroad. The locomotives enjoyed popularity among railroad engineers for much of the interwar period that the British-built locomotives were almost immediately retired from service. In the late 1920s, the Manila Railroad also ordered locomotives from Baldwin Locomotive Works. This became the Manila Railroad 140 class.

Despite being the first locomotives built by Baldwin, the 140 class was based on a design created by competing H.K. Porter. After replicating the success of the Porter design during its first runs between 1927 and 1928, a four-axle version was ordered. This became the 250 class.

Design

The design of the 250 class was based on the 140 class, and was modified by Baldwin subsidiary Eddystone Arsenal. Like the Alco-built 170 and 200 classes, the 140 and 250 classes were built with a majority of the locomotive having similar (and therefore interchangeable) parts. The tubes, flukes, cylinders, piston valves, arch tubes, among other specifications, were made similar to those of the 140 class. However, the piston valves had a lengthened stroke while the driver diameter was shrank to 45 in (1,100 mm) from 54 in (1,400 mm). This was done to achieve a higher tractive effort.

Service

The 250 class entered service in 1929. However, the 250 class did not have as much documentation as its Pacific-type sister class and information regarding them was scarce. It remains unknown when exactly the 250 class locomotives were decommissioned, presumably before all steam locomotives were retired from mainline service on August 15, 1956. With all steam locomotives of the Manila Railroad era being extinct, the class was eventually scrapped after its retirement.