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Italian State Railway class 691
Italy | 1928
33 produced
691.022 in the “Leonardo da Vinci” museum in Milan
691.022 in the “Leonardo da Vinci” museum in Milan
Jakub Halun
General
Built1928-1934
ManufacturerFS, Breda
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length74 ft 3 1/8 in
Length loco45 ft 2 15/16 in
Wheelbase35 ft 11 1/8 in
Rigid wheelbase14 ft 1 5/16 in
Total wheelbase65 ft 1 1/8 in
Empty weight178,574 lbs
Service weight199,518 lbs
Adhesive weight119,049 lbs
Total weight330,693 lbs
Axle load39,683 lbs
Water capacity7,661 us gal
Fuel capacity10,362 lbs (coal)
Boiler
Grate area46.3 sq ft
Firebox area183 sq ft
Tube heating area2,368.1 sq ft
Evaporative heating area2,551 sq ft
Superheater area721.2 sq ft
Total heating area3,272.2 sq ft
Power Plant
Driver diameter79.9 in
Boiler pressure232 psi
Expansion typesimple
Cylindersfour, 17 11/16 x 26 3/4 in
Power
Power sourcesteam
Indicated power1,730 hp (1,290 kW)
Optimal speed27 mph
Top speed81 mph
Starting effort41,488 lbf
Calculated Values
steam locomotive
express
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