File:B&O 1895 loco.png - Wikipedia
London Underground diesel locomotives - Wikipedia
London Underground electric locomotives - Wikipedia
File:Ruislip London Underground Battery Locomotives L63 & L67.jpg
History of the London Underground - Wikipedia
London Underground Central Line, RailTransportinLondon Wiki
File:L11 electric locomotive LU.jpg - Wikipedia
London Underground A60 and A62 Stock - Wikipedia
Bakerloo line - Wikipedia
Multiple unit - Wikipedia
Locomotive - Wikipedia
East Coast Main Line - Wikipedia
Metropolitan line - Wikipedia