The Great Western Railway road motor services operated from 1903 to 1933, both as a feeder to their train services, and as a cheaper alternative to building new railways in rural areas. They were the first successful bus services operated by a British railway company.
Faced with an estimate of £85,000 to build a light railway to serve the area south of Helston in Cornwall, the Great Western Railway decided to test the market with bus services on the route. They managed to acquire two vehicles that had been used temporarily on a Lynton and Barnstaple Railway service. The service proved so popular and profitable that further routes were soon established at Penzance and Slough.
By the end of 1904, 36 buses were in operation, 10 more than were in service in London. When the Great Western Railway (Road Transport) Act was passed in 1928 the Great Western had the largest railway bus fleet. This Act regularised the railway's operation of road services and also paved the way for them to be transferred out of the railway's control to bus companies, although the railway was to be a shareholder in these companies and there would still be an effort to co-ordinate to road and rail services.
The first vehicles were 16 hp Milnes-Daimler single-deck buses. They were soon supplemented by 20 hp, and later, 30 hp vehicles from the same company. Smaller numbers of vehicles were also supplied by Dennis, Durkopp, Straker-Squire, and Wolseley, as well as a few Clarkson 20 hp steam buses. Later buses were obtained from AEC, Chevrolet, Daimler, Guy, Leyland, Maudslay, Thornycroft, and a few from Burford, Clement-Talbot, Crossley, Ford, Gilford, Graham Dodge, Guy, International, Lancia, Morris, Overland BMT, and Vauxhall.
Buses for busier routes were double-deck, while some had luggage compartments for carrying mail bags. For tourist excursions, vehicles – known as "Jersey Cars" – were open, with seats arranged in tiers so that passengers sitting at the back could see over the heads of those in front. More familiar coach types were introduced later and were used on excursions and long-distance "Land Cruises".