as part of the ATP project, a two kilometre section of the tracks near the Pak Shek Kok reclamation, curving around the former coastline, was straightened out during the mid-1990s. The tracks now run alongside the Tolo Highway. A vestige of the former alignment, an old bridge beside Cheung Shue Tan village built between 1906 and 1909, was identified by the Antiquities and Monuments Office in 2008 as a historic asset. In 2002, an automatic train operation (ATO) system was added to TBL, which controls the speed of the train for the driver and ensures that all trains will stop when arriving at every station. Under normal circumstances, most trains are operated in ATO mode except for scenarios such as operation of trains in and out of train depots, driver training, or at times when the ATO system fails to function properly. However, intercity trains using the East Rail line continue to operate on AWS. Recent developments In 2004, the railway was extended in tunnel to a new southern terminus at East Tsim Sha Tsui station. On 28 December 2004, a branch to the East Rail, the Ma On Shan Rail was added, with an interchange at Tai Wai. On 15 August 2007, an extension from Sheung Shui station northwest through a tunnel to Lok Ma Chau station was opened. This provides a second border crossing between Hong Kong SAR and Mainland China. On 16 August 2009, Hung Hom became the southern terminus of both East Rail line and West Rail line after the completion of the Kowloon Southern Link. East Tsim Sha Tsui became an intermediate station on West Rail line (now part of Tuen Ma line). On 15 May 2022, an extension from Hung Hom southward across Victoria Harbour to a new southern terminus at Admiralty station was opened as part of phase two of the Sha Tin to Central Link (SCL). An intermediate station was opened at Exhibition Centre. Tunnels Tunnels on the East Rail line have numbers assigned to them. When the railway was first opened, there were five tunnels: North of today's Mong Kok East station Beacon Hill Tunnel South of where University station stands today North of university station At Tai Po Kau During the construction of the Cross-Harbour Tunnel, which opened in 1972, the section of tracks near Oi Man Estate, Ho Man Tin was covered to construct the section of Princess Margaret