Swiss Federal Railways Eem 923
Although nearly all tracks in Switzerland are electrified, there are still a few short sections in yards or in industrial sidings which don't have a catenary. So trains which operated over these short non-electrified parts either needed a diesel locomotive over their full length or the locomotive had to be changed. To overcome this and to reduce its carbon footprint, the SBB ordered an electro-diesel shunter.
Stadler won the tender with their Eem 923 “Butler” that was based on the Ee 922 electric shunter. 30 have been delivered in 2012 and 2013. The power in electric mode was increased to 1,500 kW and a 336 kW diesel engine was added for the non-electrified sections. While its predecessor can only reach 40 km/h when running under its own power, the new locomotive can reach 120 km/h.
Technical data
General
| Property | light variant | heavy variant |
|---|---|---|
| Built | 2011-2013 | |
| Manufacturers | Stadler | |
| Wheel arrangement | B | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | light variant | heavy variant |
|---|---|---|
| Length | 9.13 m | |
| Wheelbase | 4.30 m | |
| Rigid wheelbase | 4.30 m | |
| Service weight | 41 t | 45 t |
| Adhesive weight | 41 t | 45 t |
| Axle load | 20.5 t | 22.5 t |
Power
| Property | light variant | heavy variant |
|---|---|---|
| Power source | electric - AC + diesel-electric | |
| Electric systems | 15.000 V 16,7 Hz, 25.000 V 50 Hz | |
| Hourly power | 1,500 kW (2,039 PS) | |
| Engine power | 336 kW (457 PS) | |
| Top speed | 120 km/h | |
| Starting effort | 150.0 kN | |
Calculated values
| Property | light variant | heavy variant |
|---|---|---|
| Factor of adhesion | 1 : 2.68 | 1 : 2.94 |
| Power-to-weight ratio | 36.6 kW/t | 33.3 kW/t |
| Adhesive weight/Total | 1 : 1.00 | |
