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Italian State Railway class 740
Italy | 1911 | 470 produced
In August 1973 in Nova Gorica, Slovenia
In August 1973 in Nova Gorica, Slovenia
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The Grupo 740 of the Italian State Railway was a freight locomotive with a 2-8-0 wheel arrangement, which achieved the highest number of all steam locomotives on this railway. It was based on the Grupo 730, but unlike it had no compound engine and was superheated. From 1911 the locomotives were supplied by Breda and Ansaldo and after the First World War Henschel supplied a larger number as reparation, which had three-axle tenders instead of four. A total 470 were made by 1923.

Like the 730, they could be used freely due to their low axle load and could also pull passenger trains if necessary. Officially they were approved for a speed of 65 km/h, but could also reach up to 80 km/h. Seven were rebuilt to Caprotti valve gear, which was successful, but due to more difficult maintenance led to these locomotives being retired in the 1960s.

The rebuilds to Franco Crosti boilers, which was carried out on 175 locomotives, was more successful. These were divided into Grupo 743, which had a preheater on both sides of the boiler, and Grupo 741 with only one preheater under the boiler, which delivered the same power. Both the rebuilt and non-rebuilt ones survived until the end of the steam age on the FS in the seventies. Some were even kept as reserves until the early nineties. A total of 49 were preserved, three of which are still operational.

Variantthree-axle tenderfour-axle tender
General
Built1911-1923
ManufacturerBreda, Ansaldo, Henschel
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length59 ft 3 5/8 in65 ft 2 7/8 in
Wheelbase23 ft 11 3/8 in
Fixed wheelbase9 ft 10 1/8 in
Total wheelbase55 ft 6 15/16 in
Empty weight131,836 lbs
Service weight146,607 lbs
Adhesive weight124,341 lbs
Total weight216,935 lbs255,956 lbs
Axle load31,085 lbs
Water capacity3,170 us gal5,812 us gal
Fuel capacity13,228 lbs (coal)
Power
Power sourcesteam
Indicated power966 hp (720 kW)
Optimal speed18 mph
Top speed40 mph
Starting effort34,156 lbf
Power Plant
Driver diameter53.9 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 21 1/4 x 27 9/16 in
Boiler
Grate area30.8 sq ft
Firebox area115.2 sq ft
Tube heating area1,527.4 sq ft
Evaporative heating area1,642.6 sq ft
Superheater area573.7 sq ft466.1 sq ft
Total heating area2,216.3 sq ft2,108.6 sq ft
Calculated Values
steam locomotive
freight
last changed: 01/2024
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