question: What ran along the Cam valley to a terminal basin at Paulton?
context: Somerset has 6,531 km (4,058 mi) of roads. The main arterial routes, which include the M5 motorway, A303, A37, A38, A39, A358 and A361 give good access across the county, but many areas can only be accessed via narrow country lanes.Rail services are provided by the West of England Main Line through Yeovil Junction, the Bristol to Exeter Line, Heart of Wessex Line which runs from Bristol Temple Meads to Weymouth and the Reading to Taunton Line. The key train operator for Somerset is Great Western Railway, and other services are operated by South Western Railway and CrossCountry.
  Bristol Airport, located in North Somerset, provides national and international air services.
  The Somerset Coal Canal was built in the early 19th century to reduce the cost of transportation of coal and other heavy produce. The first 16 kilometres (10 mi), running from a junction with the Kennet and Avon Canal, along the Cam valley, to a terminal basin at Paulton, were in use by 1805, together with several tramways. A planned 11.7 km (7.3 mi) branch to Midford was never built, but in 1815 a tramway was laid along its towing path. In 1871 the tramway was purchased by the Somerset & Dorset Joint Railway (S&DJR), and operated until the 1950s.
  The 19th century saw improvements to Somerset's roads with the introduction of turnpikes, and the building of canals and railways. Nineteenth-century canals included the Bridgwater and Taunton Canal, Westport Canal, Glastonbury Canal and Chard Canal. The Dorset and Somerset Canal was proposed, but little of it was ever constructed and it was abandoned in 1803.
  The usefulness of the canals was short-lived, though some have now been restored for recreation. The 19th century also saw the construction of railways to and through Somerset. The county was served by five pre-1923 Grouping railway companies: the Great Western Railway (GWR); a branch of the Midland Railway (MR) to Bath Green Park (and another one to Bristol); the Somerset and Dorset Joint Railway, and the London & South Western Railway (L&SWR). The former main lines of the GWR are still in use today, although many of its branch lines were scrapped as part of the Beeching cuts. The former lines of the Somerset & Dorset Joint Railway closed completely, as has the branch of the Midland Railway to Bath Green Park (and to Bristol St Philips); however, the L&SWR survived as a part of the present West of England Main Line. None of these lines, in Somerset, are electrified. Two branch lines, the West and East Somerset Railways, were rescued and transferred back to private ownership as "heritage" lines. The fifth railway was a short-lived light railway, the Weston, Clevedon & Portishead Light Railway. The West Somerset Mineral Railway carried the iron ore from the Brendon Hills to Watchet.
answers.text: Somerset Coal Canal