Battery train
Vivarail’s first two-car battery unit is in the final-build stages and is due to run on the national network this summer.
VIVARAIL’S first two-car battery unit is in the final-build stages and is due to run on the national network this summer, the company confirmed on February 21.
Two-car 230002, converted from redundant D-Stock, has been approved for passenger use and is the first production battery unit in the UK. The company described it as “a simple and elegant design that will allow battery trains to replace diesel units with a minimum of time and effort”.
Power is provided by two lithium ion batteries per vehicle (four per train). This provides 106kWh, requiring an eight-minute charge at the end of each journey to run 40 miles. Vivrail said that with a ten-minute charge that range is extended to 50 miles. As battery technology improves, so these distances can be extended.
On safety, Vivarail said: “The lithium ion batteries on our trains work only within defined temperature parameters and performance is constantly monitored - so should an incident occur it can be quickly contained and the gases will be filtered before being allowed to dissipate naturally.”
A seven-year lifespan is expected for the batteries. They fit into the same space as a diesel genset.
The two-car ‘230’ can be charged via existing overhead line electrification or third-rail, while for non-electrified routes Vivarail has developed a static battery bank as an alternative charger.
The company has also developed an automatic charging point, whereby when the train stops at a certain point it connects to a power source. The rate of charge is identified by on-board electronics. Once the charge is complete, the ‘230’ can continue its journey.
For the charging point an electrical supply of 11kV or 33kV is required. If the supply is not strong enough, then the static battery bank can be used. They charge overnight at a low rate and provide power through the day as needed, similar to that used on motorway service areas for electric cars.
Vivarail also has three-car 230001, a diesel prototype, approved for passenger use. The company has a deal in place with West Midlands Trains to supply three two-car D-Trains for the Bedford-Bletchley route from later this year ( RAIL 842).