UK study for DoT shows trains could run 600 miles on a single charge.

Guardian: “The experts, working on behalf of the )Department of Transport) looked into two options, the first of which would see a relatively small battery – still weighing up to two tonnes – with a shorter range, which would be mechanically swapped at stations.” “The other notion was seen as more feasible: a single, eight-tonne battery, which could propel a train service for around 600 miles at a time, using a super capacitor or flywheel for the varying power requirements of the route.” Diesel prices would have to more than double to make the batteries viable.