Categories: Project Engineering



This project involved the conversion of a fleet of diesel engineering locomotives to battery/4th rail traction for London Underground. The existing diesel powered Schoma CF-500 locomotives were little used due to the diesel emissions being incompatible with use in LU’s deep tube tunnels. The concept was to take these locomotives and convert them to a “clean” power source. This also needed to be independent of the 3rd/4th traction current rails when being used in an engineering possession (where the traction current is generally turned off). 

Clayton Equipment Ltd. won the contract with their design for a battery locomotive that could operate on 3/4th rail when required, and to charge the on-board battery.

Tribe Engineering wrote and managed the Technical Requirements Specification and all project engineering aspects of the conversion through concept, tender, build, test and service introduction.



Clayton Equipment CB40 Locomotive