Sr2

Sr 2 in Helsinki 30.7.1997. Photo by Kimmo Kotimäki.

Sr 2 is the newest and the most effective locomotive in Finland. The new Sr 2 locomotives will operate at speeds up to 200 km/h in Intercity service, and will also haul heavy freight trains. About 50% of the locomotive will be manufactured in Finland. First locomotives from a serie of 20 were delivered in 1996. On 12th January 1999 VR ordered 20 locomotives more and on 29th December 2000 another 6 locomotives, so total number of Sr2 locomotives will be 46 on year 2003.

Sr2 is a member of the "Lok 2000" family and the design is closely based on the Re 460 of the Swiss Federal Railways as well as the Re 465 of the Bern-Lötschberg-Simplon Railway. Norway State Railways NSB has ordered same locomotive with type name El18 .

The VR performance specification requires:

Superior running characteristics throughout, especially in curves
The ability to travel at 200 km/h over straigth sections of existing tracks
Minimal pressure waves when passing other trains, particulary in tunnels
A total mass limited to 82 t
Optimal adhesion under all track conditions

Optimal high-speed and curve capabilities are combined within the same motive power unit. A completely new bodyshell and bogie design is also required. The structural design of the light-weight body was computer-optimized and the overall configuration tested in a wind tunnel. The air conditioned and pressure-tight driver cabs are of fibre-reinforced plastic sandwich construction.

The electrical equipment supplied by ABB emdodies converter technology with three-phase traction motors and the latest GTO (gate turn-off) power thyristors, as well as "MICAS" microprocessor control using optical fibres. In view of the high power requirements, each traction motor is supplied from dedicated inverter, resulting in both improved performance and reduced wheel maintenance. Braking energy is fed back into the catenary.

Technical Details

Gauge: 1524 mm
Feeding system frequency: 50 Hz
Nominal line voltage: 25 kV
Wheel arrangement: Bo'Bo'
Mass of electricial equipment: 37.3 t
Mass of mechanical equipment: 44.7 t
Mass in running order: 82t
Traction motors: 4 Asynchronous three-phase AC
Continuous rating at wheel rim: 5000 kW
Continuous tractive effort at wheel rim: 240 kN
Starting tractive effort at wheel rim: 300 kN
- Corresponding traveling speed range: 0-70 km/h
Maximum dynamic braking effort at wheel rim: 300 kN
Maximum one-hour rating at wheel rim: 6000 kW
Maximum speed: 230 km/h
Transmission gear ratio: 1:3.667
Buffer-to-buffer length: 18500 mm
Overall width: 3000 mm
Height over roof: 4310 mm
Distance between bogie pivots: 11000 mm
Bogie wheel base: 2800 mm

Diameter of driving wheels:

new: 1100 mm
half worn: 1065 mm
full worn: 1030 mm

Manufacturer:

Mechanical parts:

Transtech Oy, Finland

Bogies:

SLM Swiss Locomotive and Machine Works Ltd., Winterthur

Electrical parts:

ABB Transportation Systems Ltd , Zürich
ABB Signal Oy, Finland

Final assembly:

Transtech Oy, Finland

Tractive effort of Finnish electric locomotives.

Source: Sr2 leaflet from ABB

See also

Note that we don't work for VR . Feedback welcomed at . Created Thu, Oct 9 1997 Kimmo Kotimäki. Updated Wed, Mar 7 2007 Kimmo Kotimäki. Copying is only allowed for personal use.