The reference for locomotives and railcars


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Hungarian State Railways and Košice–Bohumín Railway series TVa
later series 376, Czechoslovak State Railways class 320.2 and Yugoslav Railway class 50
Austria-Hungary | 1910 | 330 produced
No. 7720
No. 7720
ETH-Bibliothek Zürich
Variantcompoundsuperheated simple
Axle config2-6-2T (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length32 ft 2 5/8 in
Wheelbase21 ft 5 1/16 in
Fixed wheelbase8 ft 5 9/16 in
Empty weight76,203 lbs80,116 lbs
Service weight98,723 lbs102,184 lbs
Adhesive weight59,525 lbs63,295 lbs
Axle load19,842 lbs20,437 lbs
Water capacity1,321 us gal
Fuel capacity4,409 lbs (coal)
Power sourcesteam
Estimated power469 hp (350 kW)536 hp (400 kW)
Optimal speed23 mph21 mph
Top speed28 mph
Starting effort13,241 lbf16,296 lbf
with start valve15,889 lbf
Power Plant
Driver diameter40.9 in
Boiler pressure203 psi174 psi
Expansion typecompoundsimple
Cylinderstwo, HP: 14 9/16 x 21 1/4 in
and LP: 22 1/16 x 21 1/4 in
two, 14 9/16 x 21 1/4 in
Grate area17.2 sq ft16.7 sq ft
Firebox area75.9 sq ft78 sq ft
Tube heating area855.6 sq ft623.6 sq ft
Evaporative heating area931.5 sq ft701.6 sq ft
Superheater area182 sq ft
Total heating area931.5 sq ft883.6 sq ft
Calculated Values
steam locomotive
tank locomotive
secondary line
last changed: 08 2023

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