Gas Turbine no.18000

Yes, I know this isn't preserved steam. But I thought it was interesting just the same.
During a visit to Barrow hill roundhouse open day in April 2009 I spied this amazing beast. No 18000 was the prototype gas turbine loco built for BR in 1949 by Brown, Boveri & Cie. It had, however, been ordered by the Great Western Railway in 1940, but construction was delayed due to World War II. It spent its working life on the Western Region of British Railways, operating express passenger services from Paddington. No. 18000 was of A1A-A1A wheel arrangement and its gas turbine was rated at 2,500 hp. It had a maximum speed of 90 miles per hour and weighed 115 tons.

Photo (at Barrow hill roundhouse) DGC.