GT3.

GT3, meaning Gas Turbine number 3, was a prototype mainline gas turbine locomotive built in 1961 by English Electric at their Vulcan Foundry in Newton-le-Willows to investigate the use of its gas turbines in rail traction applications. It was designed by English Electric engineer J. O. P. Hughes in a project that started in the early 1950s. Externally it resembled a steam tender locomotive, but the tender carried kerosene fuel. The designer said the traditional chassis and mechanical transmission avoided complications with (at the time of its conception) relatively untried technologies for bogies and electrical transmission.

Only one was made for British Rail and it went through a series of tests on BR's Great Central Main Line. It was ultimately scrapped a few years later despite performing favorably. Two ended diesel electric locomotives were simply more practical.