Gas turbines of 8500 hp in locomotive service on the Union Pacific Railroad have accumulated over 95,000 fired hr since the first locomotive was placed in main-line duty September 1958. Nineteen locomotives are now operating; 11 more will be delivered by July 1961. The rugged conditions of railroad service are ideal for accelerated field testing. Improvements developed from operation of the first turbines have been incorporated in all turbines delivered later. This field development is expected greatly to reduce maintenance and improve reliability of the entire fleet. Power plant is a new model General Electric frame size 5, simple-cycle, single-shaft, two-bearing machine having a 16-stage axial compressor and 2-stage turbine.

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