Swiss Federal Railways Re 4/4I
Switzerland 1946 50 produced
In order to be able to haul express trains also in curves at the same speed as railcars, the SBB ordered an electric locomotive with an axle load of only 14 tonnes. With the light steel wagons it was possible to reach the required speeds even with a light locomotive. A total of 50 locomotives were built in two batches. The first batch had an electric brake and partly multiple controls, the second batch didn't have either. They were initially called Re 4/4 and only renamed with the introduction of the Re 4/4II. Some of them were used until 1998, at last in regional traffic and for shunting.
Technical data
General
| Property | first batch | second batch |
|---|---|---|
| Built | 1946-1948 | 1950-1951 |
| Manufacturers | mechanical part: SLM, electrical part: BBC, Oerlikon, SAAS | |
| Wheel arrangement | B-B | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | first batch | second batch |
|---|---|---|
| Length | 14.70 m | 14.90 m |
| Wheelbase | 10.80 m | |
| Service mass | 57 t | |
| Adhesion mass | 57 t | |
| Rigid wheelbase | 3.00 m | |
| Axle load | 14.3 t | |
Power
| Property | first batch | second batch |
|---|---|---|
| Power source | electric - AC | |
| Hourly power | 1,850 kW (2,515 PS) | 1,900 kW (2,583 PS) |
| Top speed | 125 km/h | |
| Starting effort | 135.0 kN | |
Calculated values
| Property | first batch | second batch |
|---|---|---|
| Factor of adhesion | 1 : 4.14 | |
| Power-to-weight ratio | 32.5 kW/t | 33.3 kW/t |
| Adhesive weight/Total | 1 : 1.00 | |
