The Glasgow, Paisley and Greenock Railway (GP&GR) was an early Scottish railway, opened in 1841, providing train services between Greenock and Glasgow. At the time the River Clyde was not accessible to sea-going ships, and the intention was to compete with river boats that brought goods to and from the city. In fact passenger traffic proved surprisingly buoyant, and connecting steamer services to island resorts in the Firth of Clyde provided a very great source of business. The GP&GR merged with the larger Caledonian Railway in 1851.