This photograph from the 'Electrical Times', January 1917 shows a woman guard on the electrified line of the Metropolitan Railway, part of the London Underground tube network, which at that time ran from Aldgate to Harrow.

Title	Women guards on electric trains, 1917
Maker	--
Production Date	1917
Format	Photograph
Copyright	--
Holding Institution	TUC Library Collections, London Metropolitan University
Related Objects	--