SNCF Class BB 26000
BB 26002 "Souffelweyersheim" at Villeneuve-Saint-Georges trainyard (2006)
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| Type and origin | |
|---|---|
| Power type | Electric |
| Builder | GEC Alsthom / MTE |
| Build date | 1988-1998 |
| Total produced | 234 |
| Specifications | |
|---|---|
| UIC class | B'B' |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Wheel diameter | new 1,256 mm (49.45 in), worn 1,180 mm (46.46 in) |
| Minimum curve | → |
| Wheelbase |
bogie pivot distance 9.684 m (31 ft 9 1⁄4 in) axle distance 2.797 m (9 ft 2 1⁄8 in) |
| Length | 17.71 m (58 ft 1 1⁄4 in) |
| Width | 3.026 m (9 ft 11 1⁄8 in) (or 2.93 m (9 ft 7 3⁄8 in) |
| Height | 4.270 m (14 ft 1⁄8 in) |
| Loco weight | 88.825 tonnes (87.422 long tons; 97.913 short tons) |
| Electric system(s) |
Catenary 25 kV AC or 1500 V DC |
| Current collection | Pantograph |
| Loco brake | Electro-dynamic Rheostatic, Mechanical disc brakes, and parking brake |
| Performance figures | |
|---|---|
| Maximum speed | 200 km/h (120 mph) |
| Power output | 5.6 MW (7,500 hp) |
| Tractive effort |
starting 320 kN (72,000 lbf) at 80 km/h (50 mph) 220 kN (49,000 lbf) at 200 km/h (120 mph) 100 kN (22,000 lbf) |
| Career | |
|---|---|
| Numbers | 26001-26234 |
The SNCF BB 26000 locomotives are a class of dual voltage, four axle B'B' electric locomotives capable of a top speed of 200 km/h built by GEC Alsthom between 1988 and 1998 for SNCF. The locomotives are also commonly known as the Sybics.
The class were built to fulfil both freight and passenger roles; the specifications included the ability to haul 16 Corail coaches at 200 km/h (120 mph) on a 0.25% gradient, and to haul a 2,050 t (2,020 long tons; 2,260 short tons) freight train at 80 km/h (50 mph) on a 0.88% gradient.
The locomotives are a two cabin design with the body built out of steel, two pantographs are fitted; one for 1500 V operation, the other for 25 kV operation. A 25 kV AC supply is stepped down and rectified to 1500 V, a 1500 V supply feeds the power electronics directly. Each of the three elements of the thyristor bridge based three phase inverter circuits are connected in parallel, with the two three phase supplies per motor being series connected. For speeds below 15 km/h (9.3 mph) one supply voltage reducing chopper circuit (French:) per motor bogie is used to assist control. The power electronics of the two motor bogies are connected in parallel, and are evaporatively cooled by boiling Freon 113.
The bogies are a monomoteur design, with helical spring primarily suspension.
The traction motors are three phase synchronous type (as used in the contemporary TGV Atlantique) but with two three phase stator windings offset by 30 degrees. Drive from the traction motors to wheel is via a floating ring vibration isolation element (French:anneau dansant) and hollow shaft drive.
Mono-motor bogies were chosen based on the good performance in the SNCF BB 22200, SNCF BB 15000 and SNCF BB 7200 classes. A synchronous motor was chosen over a commutated motor or an asynchronous motor due to the reduced mass, simplicity of equipment, and price.
Two locomotives SNCF BB 20011 and 20012 were used to develop and test the dual voltage traction system, microprocessor control systems and auxiliary motors, BB 20012 was used to develop and test the pneumatic and electrical braking system.
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