Tai Po Kau
In 1975, the KCR asked two consultancies, Sofrerail and Transmark, to make proposals on the modernisation of the line. In 1979, Transmark's proposal to double-track and electrify the entire line for $2.5 billion (in 1979 prices) was accepted by the government. This work involved building a new tunnel through Beacon Hill as the existing tunnel was not wide enough to accommodate two tracks. New stations were added, including Kowloon Tong station, which was completed in 1982 to provide an interchange with the new MTR network. Tai Po Kau station and the original Tai Po Market station were closed, with the latter being redeveloped into the Hong Kong Railway Museum. The development finished in sections between 1982 and 1983, with new Metro Cammell EMUs, manufactured by Metro-Cammell in England, replacing diesel locomotives.