1903 Petrol Electric Autocar. In 1903 the North Eastern Railway built two experimental railcars at their carriage works in York. These were powered by petrol engines which generated electricity for two traction motors which were mounted on the bogie underneath. This means of powering a railway vehicle was pioneering and would eventually be developed into the diesel-electric technology that powered and powers many locomotives worldwide. The railcars were numbered 3170 and 3171 and were 53.5 feet (16.3 m) long and weighed around 35 long tons (36 t) . The engine was mounted in an engine compartment 13.25 feet (4.04 m) long. The rest of the vehicles' length was taken up by a vestibule, driving compartment and a 52-seat passenger compartment.