After 1923 the station came under the control of the London & North Eastern Railway until it was given to the London Passenger Transport Board ( LT ) on 14 December 1947 as part of the extension of the Central Line services of the London Underground . After 1923 the station came under the control of the London & North Eastern Railway until transfer to the London Passenger Transport Board ( LT ) on 14 December 1947 as part of the extension of the Central Line services of the London Underground .