Development of a Regenerative Braking System for Multiple-Unit Stock

The paper describes an experiment made by London Transport on a novel system of control of regeneration with multiple-unit stock. It lists the difficulties and explains the means by which they were overcome. Three equipments, designed by three electrical manufacturers in close co-operation with London Transport to satisfy the conditions of regeneration, are described and the various problems arising during the tests, with their solutions, are explained. Economic factors to be assessed are given.