In 1933, Green Line operated coaches across the home counties and London.
The Transport Act 1980 deregulated coach services, and Green Line was able to expand services beyond its traditional area, to Cambridge (route 797), Oxford (routes 290 and 790, in conjunction with the Oxford Bus Company), Northampton and Brighton.
A daily commuter on a Green Line bus from the suburbs to Central London Fred Hopkins romantically pursues a fellow passenger Jane with the help of Briggs the bus conductor.
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Capital Logistics also operated Connections branded Optare Excels on local Uxbridge - Heathrow route U3 and the ex-Green Line route 726 gained from London Coaches, replacing the Ikarus 480-bodied DAF SB220s initially used.