London Underground rolling stock 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. After the District Railway had electrified in 1907 it
British Rail Class 501 jointly operated with London Underground's Bakerloo and District Lines. In 1970 the trains were converted to 3rd rail only operation, although the 4th rail was retained on sections of line which are shared with London Underground trains. The original electric scheme on these lines was at 630V DC, which was actually supplied at +420V in the outer electric rail and -210V in the centre one, a total potential difference of 630V. This was the same system as used at the time (and still employed today) by London Underground, and allowed Underground trains to run over the lines, from Queens Park