LMS Turbomotive
The LMS Turbomotive was a modified LMS Princess Royal Class steam turbine locomotive designed by William Stanier and built by the London, Midland and Scottish Railway in 1935. It was inspired by the Swedish Ljungström locomotives first introduced in 1922. It used turbines instead of cylinders. It was later rebuilt as a conventional locomotive No. 46202 Princess Anne. Design The locomotive chassis was constructed as the third prototype of the LMS Princess Royal Class, utilising the class frame design, and numbered 6202. The forward turbine had 18 rows of blading. Power output was at 7,060 rpm, corresponding to running at . Boiler pressure was . The turbine was designed to operate into a maximum back-pressure of , allowing a conventional double blast-pipe to provide the boiler draught, and eliminating draught fans, which always seemed to give a disproportionate amount of trouble. The reverse turbine had four rows of blades. It was engaged by a dog clutch, activated when the reverser lever was set to "0". This was originally steam-operated by a small piston and cylinder. Compared to some other experimental steam locomotives of the era, such as the LNER's W1, Turbomotive was relatively successful, showing a saving of coal compared