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Rete Sicula class H
Italian State Railway class 910
Italy | 1905 | 54 produced
Locomotive Magazine, January 1908

In order to modernize the locomotive park on the Sicilian network and to ensure the operation of passenger trains on new routes, Guglielmo Cappa developed the class H. Since the same maximum speed should be achieved in both directions and the locomotives should also be able to be used on secondary routes, it was designed as a tank locomotive with a 2-6-2T wheel arrangement and an axle load of 14 tonnes. It was powered by a two-cylinder compound engine with a high-pressure cylinder on the left side. In order to ensure sufficient traction on the mountainous routes in Sicily, the coupled wheels were designed with a diameter of just 1,510 mm.

The first six pieces were delivered to the Rete Sicula in 1905 and numbered 401 to 406. The next six have already been taken over directly by the FS and, together with the first ones, have been classified in the number range from 9101 to 9112. Since the good acceleration of the locomotives was also suitable for suburban traffic, another 42 units were ordered and stationed in Milan. The remaining machines soon came to Milan and were used there until 1955. Some engines had come to Yugoslavia during World War II and remained there after the war ended.

One example was experimentally converted into a diesel Zarlatti locomotive in 1929. The boiler was replaced with a two-stroke diesel with a compressor and connected compressed air tank. The engine filled the tank and the compressed air was eventually used to power the steam locomotive's original cylinders. Although this principle worked in general, it still had technical difficulties and was not pursued further.

General
Built1905
ManufacturerAnsaldo
Axle config2-6-2T (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length41 ft 10 1/16 in
Wheelbase27 ft 6 11/16 in
Fixed wheelbase12 ft 5 5/8 in
Service weight139,773 lbs
Adhesive weight92,594 lbs
Axle load30,865 lbs
Water capacity2,113 us gal
Fuel capacity6,614 lbs (coal)
Power
Power sourcesteam
Indicated power680 hp (507 kW)
Optimal speed30 mph
Top speed47 mph
Starting effort14,583 lbf
with start valve17,500 lbf
Power Plant
Driver diameter59.4 in
Boiler pressure188 psi
Expansion typecompound
Cylinderstwo, HP: 18 1/8 x 23 5/8 in
and LP: 27 9/16 x 23 5/8 in
Boiler
Grate area25.6 sq ft
Firebox area120 sq ft
Tube heating area1,516.1 sq ft
Evaporative heating area1,636.1 sq ft
Total heating area1,636.1 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
Guglielmo Cappa
last changed: 07/2022
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