Banner
Navigation

Navigation

loco-info.com
The reference for locomotives and railcars

Italian State Railway class 740

Italy 1911 470 produced
In August 1973 in Nova Gorica, Slovenia 8474tim CC BY-SA 3.0

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.

Technical data

General

Property three-axle tender four-axle tender
Built 1911-1923
Manufacturers Breda, Ansaldo, Henschel
Wheel arrangement 2-8-0 (Consolidation)
Gauge 1,435 mm (Standard gauge)

Dimensions and weights

Property three-axle tender four-axle tender
Length 18.08 m 19.89 m
Wheelbase 7.30 m
Empty mass 59.8 t
Service mass 66.5 t
Adhesion mass 56.4 t
Total mass 98.4 t 116.1 t
Rigid wheelbase 3.00 m
Axle load 14.1 t
Water capacity 12,000 l 22,000 l
Fuel capacity 6 t (coal)
Total wheelbase 16.94 m

Boiler

Property three-axle tender four-axle tender
Grate area 2.86 m²
Firebox surface 10.7 m²
Tube heating surface 141.9 m²
Evaporative heating surface 152.6 m²
Superheater surface 53.3 m² 43.3 m²
Total heating surface 205.9 m² 195.9 m²

Power plant

Property three-axle tender four-axle tender
Driver diameter 1,370 mm
Boiler pressure 12 bar
Expansion type simple expansion
Cylinders two, 540 x 700 mm

Power

Property three-axle tender four-axle tender
Power source steam
Indicated power 720 kW (979 PS)
Top speed 65 km/h
Starting effort 152.0 kN

Calculated values

Property three-axle tender four-axle tender
Factor of adhesion 1 : 3.64
Optimal speed 29 km/h
Power-to-weight ratio 10.8 kW/t
Heating Surface Equivalent 312.7 m² 292.7 m²
Cylinder volume/HSE 1 : 1,025.36 1 : 1,095.43
Adhesive weight/Total 1 : 1.18
Tractive force/Heating surface 1 : 15.42 1 : 16.20
Grate area/Heating surface 1 : 71.99 1 : 68.50
Firebox/Tube surface 1 : 13.26
Total/Superheater 1 : 2.86 1 : 3.52
Auf Deutsch umschalten

Settings

Your settings are retained for this browser session only.

Consent to cookies

We use cookies to save your display settings. If you decline, the settings are retained only for the current browser session.