and the London Electric Railway Act, 1913. The proposed extension and tunnel enlargement works were delayed by World War I and it was not until after the war that works could begin. Reconstruction, connections and extension, 1919–1926 In February 1919, with the war over, the C&SLR submitted a new bill that included provisions for an extension of time for the tunnel enlargement works approved in the act of 1913. The resulting act was passed on 19 August 1919 as the City and South London Railway Act, 1919. In 1920, under special wartime provisions, the LER was granted an extension of time to carry out the works for its own 1913 act. Although the permissions to carry out the works had been renewed, the Underground companies were not in a position to raise the funds needed to pay for the works. Construction costs had increased considerably during the war years and the returns produced by the companies could not cover the cost of repaying borrowed capital. The projects were made possible when the government introduced the Trade Facilities Act 1921 by which the Treasury underwrote loans for public works as a means of alleviating unemployment. With this support, the Underground companies were able to obtain the funds and work began on enlarging the tunnels of the C&SLR. The tunnels were enlarged by removing several of the cast iron segments from each tunnel ring, excavating a void behind to the required new diameter and reinstalling the segments with additional packing spacers. The northern section of the C&SLR between Euston and Moorgate was closed from 8 August 1922, but the rest of the line remained open with enlargement works taking place at night. A collapse on 27 November 1923 caused when a train hit temporary shoring on the incomplete excavations near Elephant & Castle station filled the tunnel with soil. The line was briefly operated in two parts, but was completely closed on 28 November 1923. The Euston to Moorgate section reopened on 20 April 1924, along with the new tunnels linking Euston to Camden Town. The rest of the line to Clapham Common reopened on 1 December 1924. At the same time as the tunnels were being enlarged, the stations were modernised, with longer platforms, a new tiling scheme on platform and passageway walls and new frontages to the surface buildings. Some stations also received escalators to replace the original lifts. While