Depends on what you define as interesting . The Class 318 ' s seen at both low level stations during their refit literally had their nose cut off and replaced with a steel plate . Which is why they look like someone smashed them into a wall . Oh , and the 314 ' s ? Entered service in 1979 , still running in 2016 . They ' re so old the family they belong to were the prototypes for electric rail systems in the UK . Bonus story about the underground Legend has it that because of the lighter stock 60 tons compared to the 100 tons of the regular network that Rangers fans were nearly banned from doing The bouncy on the train to and from games because it was shaking and rolling the train . Like I said , only a legend but I ' m sure people will agree it ' s a damn funny mental picture .