Interior of signal box at Ealing Common showing new mini- lever signal frame with staff member. Date and time of 5.20am etched onto neg. Part of a 4-day series recording the conversion of signalling and points to electricity.
Photographed by Topical Press, 10 Mar 1925
Location: Ealing Common, Ealing W5
Image no: U3478
Inventory no: 2002/18134
20th Century London caption: This image records the conversion of signalling and points to electricity. The Underground was a pioneer of electrically and pneumatically operated signalling. It replaced the older mechanical methods on the earlier lines. The date (10 March 1925) and time (5.20am) the photograph was taken, are etched onto the photo negative, with the negative number.