Aerowagon by Abakovsky

The Aerowagon or Aeromotowagon (Russian: Аэровагон, аэродрезина) was an experimental high-speed railcar fitted with an aircraft engine and propeller traction invented by Valerian Abakovsky, a Soviet engineer from Latvia. It produced speeds of up to 140 kilometres per hour (87 miles per hour). The Aerowagon was originally intended to carry Soviet officials. On 24 July 1921, a group of delegates to the First Congress of the Profintern, led by Fyodor Sergeyev, took the Aerowagon from Moscow to the Tula collieries to test it. Abakovsky was also on board. Although they successfully arrived in Tula, on the return route to Moscow the Aerowagon derailed at high speed near Serpukhov. It was never used again after the accident. The Aerowagon was a precursor to the German Schienenzeppelin railcar, the American M-497 Black Beetle railcar and the Soviet turbojet train, all three of them being experimental vehicles featuring the combination of railcar and aircraft engine.