• Singapore Traction Company
• Kampong Bahru Bus Service (established in the 1930s)
• Tay Koh Yat Bus Company (established in 1932; absorbed Seletar Motor Bus Company by 1940)
• Changi Bus Company (established in 1933)
• Green Bus Company (established in 1934; absorbed Jurong Omnibus Service in 1945)
• Katong-Bedok Bus Service Company (established in 1935)
• Paya Lebar Bus Service (established in 1935)
• Keppel Bus Company (established in 1936)
• Punggol Bus Service (established in 1936)
• Easy Bus Company (established in 1946)
• Hock Lee Amalgamated Bus Company (formed in 1951 from a merger between Ngo Hock Motor Bus Company, established in 1929, and Soon Lee Bus Company, established in 1931)

Both reports recommended that the first step towards nationalising public bus services was to merge the 10 Chinese bus companies into three regional companies servicing the eastern, northern and western parts of Singapore, alongside a reorganisation of STC (to continue servicing the central sector), which had been suffering severe operating losses. In addition, the Wilson Report also provided detailed recommendations for bus routes, frequencies, fares, vehicle design and models, design infrastructure for bus stops and terminals, and maintenance standards.

Left with no choice, the government announced the merger of the three bus companies to form Singapore Bus Service (SBS) on 1 July 1973. It was believed that a single bus operator would help eliminate the problems of wasteful competition, lack of standardisation, and duplication in route services that had dogged public bus services since the very beginning. Not unexpectedly, the merger began on a rocky note as shares of SBS were still held by the former Chinese bus companies, with allocation based on the relative sizes of the companies prior to the amalgamation in 1971. In other words, SBS was a cooperative – and not a single entity – run by 10 different companies.

The mammoth task of reorganising and overhauling SBS’s operating structure and culture was left to a task force of senior civil servants known as the Government Team of Officials (GTO) in May 1974. Appointed by then Minister for Communications Yong Nyuk Lin, the team − comprising Wong Hung Khim, Yap Boon Keng, Ang Teck Leong, Yeo Seng Teck, Lo Wing Fai, Ong Chuan Tat and Mah Bow Tan − was seconded to SBS to oversee the transformation.