The first electric railway was made by Thomas Davenport, a blacksmith in Vermont, USA, in 1835. It was a small railway powered by a miniature electric motor. The first serious attempt at electric power on a railway was made by Robert Davidson in 1842 when he tried out a battery locomotive weighing five tons on the Edinburgh & Glasgow Railway, Scotland, where it ran at 6.5km/h (4mph). The first practical electric railway was built by the German Engineer Werner von Siemens (1816-92) for the Berlin Trades Exhibition (May 31 to September 30, 1879). It was an oval about 300m (984ft) in circumference with a gauge of 1m (3.28ft). The electric locomotive had a 2.2 kW (3hp) motor, picking up current at 150V from a center third rail and returning it via the wheels and running rails. It could pull 30 passengers on three cars at 6.5km/h (4mph).