The former District Line unit (230001) travelled 200 miles in the early hours of Wednesday August 20 in a route that took it from Reading-London Paddington-Oxford-London Paddington-Reading. As the Great Western Railway (GWR) battery-powered Class 230 broke the world record for the longest journey on a single charge, railway historian and TV reporter TIM DUNN chronicled the event for RAIL from on board the train…. As the Great Western Railway (GWR) battery-powered Class 230 broke the world record for the longest journey on a single charge, railway historian and TV reporter TIM DUNN chronicled the event for RAIL from on board the train…. The former District Line unit (230001) travelled 200 miles in the early hours of Wednesday August 20 in a route that took it from Reading-London Paddington-Oxford-London Paddington-Reading. “We had dashboards feeding us what I assume was correct live data en route: showing battery charge status, speed, position, energy consumption, efficiency.