Frank Kelly first got his hands on Tube train signals as an apprentice in 1963. The kit he's still using today is older than him built in 1926.
The trains are now electric and these signals will be switched from mechanical to digital. Steve says, just like Frank, the kit still works perfectly.
The new system will be fitted in July meaning more trains will be able to pass along the track each hour, one every two minutes. It does mean Frank and his 92-year-old signalling system are retiring.