The GWR was closely involved with the C&GWUR and the B&ER and with several other broad-gauge railways. The South Devon Railway was completed in 1849, extending the broad gauge to Plymouth,[13] whence the Cornwall Railway took it over the Royal Albert Bridge and into Cornwall in 1859[14] and, in 1867, it reached Penzance over the West Cornwall Railway which originally had been laid in 1852 with the 4 ft 8+1⁄2 in (1,435 mm) standard gauge or "narrow gauge" as it was known at the time.[15] The South Wales Railway had opened between Chepstow and Swansea in 1850 and became connected to the GWR by Brunel's Chepstow Bridge in 1852.