The Plymouth Great Western Docks were constructed, as was the railway, under the supervision of
Isambard Kingdom Brunel but they were owned by an independent company in which the railway invested. The inner basin was opened in 1857 but, before the end of the year, a gale had caused extensive damage which led to financial trouble; the South Devon Railway subsequently acquired an increasing share in the company, until it took full control in 1874. A siding had been laid into the docks in 1850 which crossed Millbay Road on a
level crossing and was worked by horses;
South Devon Railway 0-4-0 locomotives operated in the docks from 1873. Extensions were laid to the West Wharf and Graving Dock in the late 1870s and, from 18 June 1878, a third rail was added to allow access for
London and South Western Railway (LSWR) goods traffic. The first passenger trains started to run through to the East Quay in 1882, The GWR route was shortened by on 1 July 1906, with the opening of the
Castle Cary Cut-Off line that avoided the "Great Way Round" through . In the early hours of 30 June 1906, an
LSWR special had derailed at high speed passing through , after which speeds returned to a more sedate pace with trains taking around five hours. The LSWR service was closed in 1910. The quayside was open to the elements until 1905, when a canopy was provided, although passengers and their luggage were dealt with in the lower floors of some Brunel-designed warehouses. Improved accommodation was provided in 1936; the new floor of which was decorated with the GWR's "land at Plymouth and save a day" advertising slogan, which referred to the time saved by trans-Atlantic passengers being carried ashore by lighter at Plymouth from liners bound for London, via
Southampton or
Le Havre. A new swing bridge with a railway track was put in place in 1945, to link Glasgow Quay (opposite the entrance from Millbay station) and South Quay. The last passenger trains ran from the docks in 1963, which was the final year of trans-Atlantic liners calling at the port. Freight traffic continued until 30 June 1971. ==Signalling==