NSE realised that something needed to be done to these lines quickly. Numerous plans for the lines were proposed. One serious plan was to close the line between Marylebone and South Ruislip/Harrow-on-the-Hill, and convert Marylebone into a coach station. Metropolitan line trains would be extended to Aylesbury and BR services from Aylesbury would be routed to London Paddington via High Wycombe. Also the line north of Princes Risborough would close. However, this did not happen as Baker Street and London Paddington would not have been able to cope with the extra trains and passengers.