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Burma Railways classes N and Ns
Burma | 1911 | 22 produced
flickr/Historical Railway Images

The class N of the Burma Railways designated 17 Mallets built by North British in four batches between 1911 and 1921. With an 0-6-6-0 wheel arrangement, they had all weight available for traction. Nevertheless, they were not only intended for freight service, but also for passenger service.

Their area of operation was the Lashio branch and the Southern Shan states. Even though they had a huge pulling power, they had to be assisted by 2-6-2T locomotives on steeper sections. In 1924 Beardmore built five superheated Ns class locomotives and rebuilt the 17 others in the same form. It didn't take long until they were superseded by the Garratts starting with the GA.I.

VariantNNs
General
Built1911-1915, 19211924
ManufacturerNorth BritishBeardmore
Axle config0-6-6-0 (Erie (Mallet)) 
Gauge3 ft 3 3/8 in (Meter gauge)
Dimensions and Weights
Length62 ft 2 1/2 in
Wheelbase24 ft 3 in
Fixed wheelbase8 ft 3 in
Total wheelbase48 ft 7 in
Service weight130,368 lbs135,520 lbs
Adhesive weight130,368 lbs135,520 lbs
Total weight200,480 lbs351,344 lbs
Water capacity2,402 us gal
Fuel capacity13,440 lbs (coal)24,640 lbs (coal)
Power
Power sourcesteam
Estimated power800 hp (597 kW)1,000 hp (746 kW)
Optimal speed19 mph23 mph
Starting effort26,766 lbf27,988 lbf
with start valve32,119 lbf33,586 lbf
Power Plant
Driver diameter39 in
Boiler pressure180 psi
Expansion typecompound
Cylindersfour, HP: 15 1/2 x 20 in
and LP: 24 1/4 x 20 in
four, HP: 16 x 20 in
and LP: 24 1/4 x 20 in
Boiler
Grate area33 sq ft
Firebox area115 sq ft
Tube heating area1,398 sq ft1,071 sq ft
Evaporative heating area1,513 sq ft1,082 sq ft
Superheater area309 sq ft
Total heating area1,513 sq ft1,391 sq ft
Calculated Values
steam locomotive
freight
passenger
Mallet
last changed: 05/2024
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