Can we afford to keep running an antique Tube?
The signal box is all well-worn steel levers you'd associate with The Railway Children.
The box is 85 years old and it controls the District and Circle Lines through the station.
London Underground showed us this to make the point that the Tube upgrades are vital.
Without them the service will rapidly start to get worse. This 1920s technology is reaching the end of its life and needs replacing.
The Unions have said it is "rotten infrastructure", although LU say it's extremely safe.
Budget cuts though are looming and the Tube upgrades look vulnerable.
The Department for Transport has a budget of £12.7 billion pounds.
Of that Transport for London gets £3.2 billion (as part of an annual £9bn budget) and £1.7bn goes on the Tube upgrades.
So if the DfT's budget is cut by 40 per cent some say the upgrades may never happen.
It's up to the Treasury to decide the level of cuts.
The Department for Transport says it's arguing the Tube upgrade is crucial to maintain economic growth.
But there will be cuts to TfL's grant. At the moment we don't know by how much. The DfT says it will be up to the Mayor to prioritise.
But if the cuts are large - worse case scenario 40% of TfL's grant - then it will be services, fares and upgrades that'll be affected.
London Underground's Howard Collins gave me a tour of the Control Centre at Earl's Court.