The final carriage of the £1.5 billion S Stock train order has been presented by Bombardier in Derby.

The intermediary car, which is still being fitted out at Bombardier’s Litchurch Lane facility, is the last of 1,395 S Stock carriages that have been built for London Underground over the past few years.

The final train will undergo testing before entering service sometime in the second half of next year.

Altogether, Bombardier is supplying 191 new trains for the Metropolitan, District, Hammersmith & City and Circle lines, which make up around 40 per cent of the London Underground system.

London Underground has praised the reliability of its modern fleet. Managing director Nick Brown, who was in Derby to mark the milestone, said the S Stock trains were delivering 110,000 kilometres between service failures.

The S Stock trains are an important element of a wider modernisation of the sub-surface rail network.