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Italian State Railway class 690 II
Italy | 1911 | 33 produced
Die Lokomotive, June 1911

Around 1910, the FS also realized that, thanks to superheater technology, compound engines could be dispensed with. Therefore the Pacifics of the class 690 II with four cylinders were commissioned. For the first time on a simple expansion locomotive in Italy, two adjacent cylinders used a common piston valve. The locomotives were designed for an axle load of 18 tonnes, but were ultimately manufactured with an axle load of only 17.1 tonnes for a better road availability.

The first nine were built with the driver's position on the right, the remaining 24 had it on the left. The firebox was partly located between the drivers and was therefore trapezoidal and narrow at the front. Since the grate had too small an area, the output was only 1,400 hp. Together with the axle load, which was still too high for most lines, no further class 690 locomotives were built. This led to a rebuild to class 691 at the end of the twenties and the class 695 to be developed as a successor.

General
Built1911-1914
ManufacturerBreda, Officine Meccaniche, Ansaldo
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length73 ft 0 15/16 in
Length loco42 ft 10 3/16 in
Wheelbase32 ft 11 11/16 in
Fixed wheelbase14 ft 1 5/16 in
Empty weight173,724 lbs
Service weight192,463 lbs
Adhesive weight112,436 lbs
Total weight301,812 lbs
Axle load37,699 lbs
Water capacity5,283 us gal
Fuel capacity17,637 lbs (coal)
Power
Power sourcesteam
Indicated power1,381 hp (1,030 kW)
Optimal speed28 mph
Top speed81 mph
Starting effort31,103 lbf
Power Plant
Driver diameter79.9 in
Boiler pressure174 psi
Expansion typesimple
Cylindersfour, 17 11/16 x 26 3/4 in
Boiler
Grate area37.7 sq ft
Firebox area172.2 sq ft
Tube heating area2,088.2 sq ft
Evaporative heating area2,260.4 sq ft
Superheater area721.2 sq ft
Total heating area2,981.6 sq ft
Calculated Values
steam locomotive
express
last changed: 02/2024
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