 This feature meant that the batteries could be changed without using an overhead crane in a lifting shop, freeing it for more important work.An eighth locomotive was built by staff at Acton Works in 1962, partly as an exercise to prove that the workshop could compete for this type of work.This vehicle was initially numbered L76, and took part in the Metropolitan Railway centenary celebrations, held on 23 May 1963, when it propelled a replica of the original inspection train of open wagons used by William Ewart Gladstone and other dignitaries.