Signal Box: Liverpool Street London Underground

The Liverpool Street London Underground Signal Box is a Grade II listed building. It features a locking room made of yellow stock brick in Flemish bond, while the operations room is timber-framed with vertical weatherboarding at dado height and horizontally-sliding sash windows. The hipped slate roof has overhanging eaves supported by curved timber brackets.

The structure is two storeys tall, with the operations room measuring two bays long and one bay wide. It is situated at the western end of the northern Metropolitan and Circle line platform. The low locking room has three blocked round-arched openings facing the track, which are partly encased by a later extension of the platform. The upper operations room has windows on all four sides, a design that reflects its original connection to a short-lived spur leading into the Great Eastern Railway’s station. The windows are six-pane, timber, horizontal sliding sash windows, and above them are panels featuring cut-out quatrefoil decoration. There are entrances at both ends of the operations room, with glazed six-pane doors accessed by modern steel steps. On the southern elevation, there is a folding timber ledge on steel brackets for window cleaning. The north-east corner connects to the station's headwall through a brick flue for the fireplace.

Inside, the operations room has dado matchboard panelling, a boarded ceiling, fitted cupboards at the west end, and an original fire surround in the north-east corner. It retains the 1954, 15 lever Westinghouse Brake and Saxby frame and control panel. The locking room was not inspected.