Federated States of Malaya Railway 4-6-4 Locomotives in Malaya
Class Details by Steve Llanso of Sweat House Media
Class New C/401, 402, 403 (Locobase 2862)
Data from [
] (originally [] first accessed 4 March 2003). See also "FMSR Class C - New C", online in the Malayan Railway blog at [], last accessed 24 October 2017. (Thanks to Dave Hayward for his 8 July 2024 email correcting a mistake in the rail gauge.) Nasmyth Wilson works numbers were 1567-1571 in 1929, North British works numbers were 24514-24519 in 1939, 24565-24569 in 1939-1940.
Similar in many ways to the main-line Class 56 Pacifics, these tank engines ran on branch lines with tighter curves.
According to Class C (later 40) consisted of two distinct designs of 4-6-4T. The original batch, delivered in 1929 by Nasmyth Wilson, had Caprotti valve gear and 23.6 sq ft (2.19 sq m) grate area. Two further batches, delivered 1939-40 from North British, had rotary cam poppet valve gear, a larger grate, and smoke deflectors. In appearance they were like a tank version of the Class O pacifics.
Six more were ordered for delivery in 1941 from NBLC (works numbers 24661-24666, but they were taken over by the War Department as class 2600 (2600-2605) and sent to Egypt for the Middle East Forces. There, their class ID was MEF 140-145
Although they were to be returned to the FMSR, the railway objected to the suggested cost on grounds that the locomotives had been heavily used. In 1949, the War Department sold the sextet to the Royal Jordan Hashemite Railway.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | New C/401, 402, 403 |
| Locobase ID | 2862 |
| Railroad | Federated States of Malaya Railway |
| Country | Malaya |
| Whyte | 4-6-4T |
| Number in Class | 16 |
| Road Numbers | 18-33/401.401.01-05, 402.01-06, 403.01-05 |
| Gauge | Metre |
| Number Built | 16 |
| Builder | North British |
| Year | 1938 |
| Valve Gear | Caprotti |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 10.96 / 3.34 |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 28,110 / 12,750 |
| Weight on Drivers (lbs / kg) | 83,440 / 37,848 |
| Engine Weight (lbs / kg) | 165,760 / 75,188 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 250 / 1720 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14.5" x 22" / 368x559 |
| Tractive Effort (lbs / kg) | 18,202 / 8256.30 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.58 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 28 / 2.60 |
| Evaporative Heating Surface (sq ft / m2) | 809 / 75.16 |
| Superheating Surface (sq ft / m2) | 180 / 16.72 |
| Combined Heating Surface (sq ft / m2) | 989 / 91.88 |
| Evaporative Heating Surface/Cylinder Volume | 192.40 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7000 |
| Same as above plus superheater percentage | 8260 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |