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The reference for locomotives and railcars

Italian State Railway class 741II

Italy 1953 81 produced
741 273 in September 1973 in Brunico Michel Huhardeaux CC BY-SA 2.0

To increase the power and efficiency of the widespread 2-8-0 freight locomotive of the class 740, the idea was to rebuild it with a Franco-Crosti boiler. At first, 94 locomotives had been rebuilt between 1937 and 1950 with two feedwater heaters on the sides of the boiler barrel to form the class 743II. Then the class 741II was created in 1953 with a single feedwater heater below the boiler barrel. It could be distinguished from its predecessor by the single chimney on the right side of the boiler barrel. 

By 1960, the Porta Vescovo workshops at Verona had rebuilt 81 locomotives to class 741II. In service they were concentrated in the north on the one hand and in Sicily on the other hand. In South Tyrol, sometimes three locomotives were used to haul 16-car express trains up the mountains. There their service ended in 1975. In Sicily, they were used a bit longer and retired in the early eighties. Today, two are still existing. 741 120 is operational and 741 137 is on static display at Pietrarsa.

Technical data

General

Property three-axle tender four-axle tender
Built 1953-1960
Manufacturers Officina Grandi Riparazioni Verona
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 68.3 t
Adhesion mass 56 t
Total mass 100.2 t 117.8 t
Rigid wheelbase 2.60 m
Axle load 14.8 t
Water capacity 22,000 l
Fuel capacity 6 t (coal)

Boiler

Property three-axle tender four-axle tender
Grate area 2.8 m²
Evaporative heating surface 112.6 m²
Superheater surface 44 m²
Total heating surface 156.6 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 810 kW
Top speed 65 km/h
Starting effort 152.0 kN

Calculated values

Property three-axle tender four-axle tender
Factor of adhesion 1 : 3.61
Optimal speed 32 km/h
Power-to-weight ratio 11.9 kW/t
Adhesive weight/Total 1 : 1.22
Tractive force/Heating surface 1 : 20.27
Grate area/Heating surface 1 : 55.93
Total/Superheater 1 : 2.56
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