Metropolitan lines * The District line upgrade has already delivered a full refurbishment of 75 of the existing ('D-stock')trains with renewed interiors, CCTV cameras inside the cars, passenger information displays, fire retardant seats and flooring and improved accessibility features such as tip-up seats to accommodate wheelchairs, buggies and luggage. This was completed in March 2008.The new fully air-conditioned and more accessible trains will operate on the line from 2013, with the full ...