The Pennsylvania Turbine Locomotive.
The Pennsylvania Railroad Turbine loco: 1944.
This loco has the turbine geared down and mechanically connected to the driving wheels, which were linked by connecting rods as in normal steam locos. As usual with mechanical drive, a separate turbine had to be provided solely for reversing.
Built by Baldwin in 1944, with turbines by Westinghouse, class S2 number 6200 was a 6-8-6. It was intended to be a 4-8-4, but WW2 restrictions on lightweight metals meant that 6-wheel bogies were needed to handle the weight.
The power output was 6900hp, making it the fastest and most powerful mechanical-drive steam turbine locomotive ever built.
The loco from the other side.
Engineering like you mean it.
The S2 regularly pulled 1000 ton trains at over 100 mph. E W Cox, a British locomotive engineer, once travelled on the footplate and reported that "100mph was maintained and exceeded for 12 consecutive minutes".
The S2 was withdrawn in 1949.