Euston signal box with its Westinghouse Brake & Signal Co. Ltd. Style 'L' Power Lever Frame station was built to the British Railways London Midland Region Type 14 design and was fitted with a 227 lever Westinghouse 'L' frame (which was purchased by the London, Midland & Scottish Railway for a re-signalling scheme at Preston but was never used). Euston box was opened by British Railways on 5th October 1952.

This was achieved with electro-mechanical points, colour light signals and full track circuiting. This signalbox only remained in use for 12 years until 27th September 1965 when Euston Station was completely rebuilt with the 25Kv overhead traction system, at this time the operation of Euston passed to Euston Power signal box with its NX Panel

The signalbox is depicted above in a night time shot around 1952 The frame is a Westinghouse Style 'L' Power Frame which is all electrically locked. The frame was formed of 19 x 12 way section 227 levers, {19x12}-1 = 227 levers, as the last “lever” space is unavailable. The frame was built is 1952 for British Rail LMR from the parts originally destined for Preston North. This lever frame saw less than 13 years service here, it being superseded when the station was modernised in the 1960's

The first train describers were temporary and two years latter new pattern magazine describers including automatic clear out were installed. Pictured in 1954 is the new pattern describers showing the describer for the Up Slow Line, which were located at the far left hand end under levers 40 to 50.

On the diagram the track circuit light are 'on' depicting up to three trains in the 'Backing out roads 1, 3 & 4.
There were three track circuits on the Backing out roads at this time (later reduced to two with the coming of the PSB) but as 4 Backing out roads could just about hold 12 coaches + loco and 1 Backing out roads could hold about 8 + loco I would suggest that there is only one train on each of the three Backing out roads shown occupied.

The south end TC on each Backing out roads (locally known as a bank) was for the Lime Street Controls and was usually two locos long only. So if you look at the south end of 2 Backing out roads you will see a single track lit and this would be a loco.

My thanks to Graham Floyd for the Backing out roads detail information

Up Fast, Down Fast, Up Slow, Down Slow, and Down Empty Carriage lines.
Camden No.1 (1233yds) was the adjacent box on the Up Fast, Down Fast, Up Slow, Down Slow, and Down Empty Carriage lines.