They also became a maintenance problem and an operational inconvenience when coupling and uncoupling cars. Fire extinguishers All tube carriages originally had fire extinguishers located at the ends of the carriages. Between 1999 and 2001, all tube carriages had their fire extinguishers removed due to excessive violence and vandalism. Fire extinguishers were often used as weapons for attacks on passengers and staff which caused services to be disrupted and too much money had to be spent on replacing fire extinguishers. Their removal was criticised following the 1987 King's Cross fire. Because of fires in tube carriages becoming very hard to start, following the train refurbishment program in the 1990s, it was decided that it was no longer cost-effective to replace stolen or damaged fire extinguishers. Their removal began on the Central line in 1999 and was completed by 2001. Fire extinguishers were instead installed in the driver's cabs and on station platforms and were removed from tube carriages. Heritage vehicles Two steam locomotives survive, one A Class No. 23 (LT L45) at the London Transport Museum, and E Class No. 1 (LT L44) is preserved at the Buckinghamshire Railway Centre. The Bluebell Railway has four 1898–1900 bogie carriages in running condition and a fifth is a static exhibit at the London Transport Museum. Also at the London Transport Museum is Metropolitan electric locomotive No. 5 "John Hampden", City and South London electric locomotive and "padded cell" carriage, District Railway E/Q23 multiple unit car, and a 1938-tube stock car. A preserved carriage at the Kent and East Sussex Railway was thought to be a District Railway first class, but now thought likely to be a cutdown Metropolitan Railway eight wheeler. The Vintage Carriages Trust has three preserved Dreadnought carriages. The Spa Valley Railway is home to two cars of T-Stock. To celebrate the 150th anniversary of the opening of the Metropolitan Railway special services ran in January 2013 using a restored 1892 "Jubilee" carriage, 1898–1900 bogie carriages, steam locomotive No. 1 and electric locomotive "Sarah Siddons". Further events are planned in 2013 for Locomotive No. 1, "Sarah Siddons" and the Jubilee carriage, including a Steam back on the Met scheduled for May. To celebrate the 150th anniversary of the District Railway the London Transport Museum are restoring a three-car Q Stock train to run on the District Line as special services during 2018. Engineering trains Locomotives Steam locomotives After the District