London Northwestern Railway ’s Class 730s will be maintained at a state-of-the-art facility in Bletchley. Britain’s newest train fleet now has a new depot after an £80 million upgrade was completed. Britain’s newest train fleet now has a new depot after an £80 million upgrade was completed. London Northwestern Railway’s Class 730s will be maintained at a state-of-the-art facility in Bletchley. During the summer London Northwestern Railways (LNR) has been rolling out its new fleet of 36 five-carriage trains on routes between Crewe, Northampton and London.