Over 4.2 million people use the London Underground each day. Although not often visible to customers, during the night thousands of people are also busy at work to ensure that the signalling, tracks and other critical infrastructure is maintained and upgraded to meet increased demands placed on the Tube network.
London Underground (LU) maintains hundreds of facilities across the capital providing access to tracks and tunnels, along with highly specialist equipment and spare parts needed for both routine maintenance and ongoing improvement work.
