[1] The National Railway Museum Archives hold the JOP Hughes papers which contain initial concept sketches for various 4-8-4 wheel arrangement single-unit configurations of the machine and early 4-6-0 tender locomotive drawings.

[1] Both the locomotive and its fuel tender were vacuum-braked, with vacuum brake ejectors being driven by air pressure bled from the turbine.

The locomotive's other auxiliaries (housed in its leading end beneath the large side air intakes) were shaft- and belt-driven.

The six-wheel chassis was based on then standard British Railways practice, albeit it with specially made and shaped side frames and bespoke tank and bodywork assembled at Vulcan Foundry.

Underframes, grilles and the front access and cab doors were painted Brunswick Green with lettering and lining in Orange.

Neither English Electric or British Railways were prepared to fund this work [2] as they were committed to diesel-electric locomotives.They were rapidly becoming the future of rail traction with ever-improving power-to-weight ratios.

[7] No detailed engineering drawings of the locomotives as built are thought to have survived, the York archive containing an internal memo instructing that these were to be returned to the Gas Turbine division of English Electric when dismantling commenced in 1965.

[2] Several articles with drawings have appeared in the railway modelling press since the locomotive was scrapped, but most appear to be based on a contemporary sectional view widely published at the time and are flawed with regard to details such as driving wheels (19-spoke), roof and side access hatches, cab rear, tender front and tender rear.

[2] In recent years a 5-inch (127 mm) gauge turbine powered model of the locomotive has been built and exhibited in the UK.