materialised out of the proposal however. When STC bus drivers went on strike in 1956, a local supplementary train service had to be provided by the Malayan Railways to provide relief for commuters affected by the strike. In 1961 the Singapore Harbour Board had 16 miles of tracks in its 950-acre site, which were connected to the main line west of Tanjong Pagar station. By the 1970s it had been renamed to the Port of Singapore Authority and owned a number of diesel shunters. Following full internal self-governance of Singapore in 1959, the new government under the People's Action Party pursued an aggressive industrialisation policy to resolve unemployment problems, one of which included building Jurong Industrial Estate in 1960. Keen on tapping the economic hinterland of Malaya, a freight-only Jurong line was built in 1963 and was opened in 1965. Trains would run west from Bukit Timah under Clementi Road, through Ulu Pandan, under a roundabout at Upper Ayer Rajah Road and Jalan Ahmad Ibrahim and branched out into three lines that penetrated into Jurong Industrial Estate. Despite high expectations of having 2-3 million tons of good moved every year, a shaky merger with Malaysia from 1963 to 1965 led to under-utilisation of the line's potential. The Jurong line eventually closed in the 1990s despite renewed calls from the Automobile Association of Singapore and various members of the public to upgrade the line for passenger service. Use of steam locomotives was discontinued in Singapore in 1972. Electrification was planned since the late 1970s but plans never come to fruition. KTM trialled railbus services using experimental vehicles from BRE-Leyland and Ganz Mavag of Hungary between Singapore and Johor Bahru in 1988. In 1982, a closed loop monorail line commenced operations at the resort island of Sentosa following the approval of plans to build it in 1979. The same year, the green light was also given to the construction of the Mass Rapid Transit (MRT) following a three-phase study conducted from 1972 to 1982 and a debate on an all-bus system against a bus-rail system. The initial MRT network opened in phases from 1987 to 1990, two years ahead of the original deadline of 1992. In 1990, a rubber-tyred automated people mover, the Changi Airport Skytrain, was opened in Changi Airport to connect between Terminal 1 and the then newly-opened Terminal 2 on both the landside and airside. Like many of its