Locomotive test report, Railway Executive Western Region appendix to report no. W14, Brown - Boveri Gas Turbine Locomotive, No 18000, Castle Class 5049, King Class 6022, Purpose of test, Performance and efficieny, Comparison of gas turbine locomotive with steam locomotive, November 1951, Origin Swindon, Edition contains text, 3 photographs, 0 diagram, 0 graphs, 0 dimensions. Brown binding.