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The Grand Union Canal in England is part of the British canal system. Its main line starts in London and ends in Birmingham, stretching for 137 miles (220 km) with 166 locks.〔(''Canal Junction:'' The Grand Union Canal )〕 It has arms to places including Leicester, Slough, Aylesbury, Wendover and Northampton.〔(''Waterscape:'' History Of The Grand Union Canal )〕 The Grand Union Canal was also the original name for part of what is now part of the Leicester Line of the modern Grand Union: this latter is now generally referred to as the Old Grand Union Canal to avoid ambiguity. ==History== With competition from the railways having taken a large share of traffic in the second half of the 19th century, improvements in roads and vehicle technology in the early part of the 20th century meant that the lorry was also becoming a threat to the canals. Tolls had been reduced to compete with the railways, but there was little scope for further reduction. The Regent's Canal and the Grand Junction Canal agreed that amalgamation and modernisation were the only way to remain competitive. The Grand Union Canal in its current form came into being on 1 January 1929, and was further extended in 1932. It was formed from the amalgamation of several different canals, and at 286.3 miles (461 km) is by far the longest canal in the UK: ;London area * Regent's Canal – original company * Hertford Union Canal – bought by the Regent's Canal in 1857 ;Main Line * Warwick and Napton Canal – bought by the Regent's Canal in 1927 * Warwick and Birmingham Canal – bought by the Regent's Canal in 1927 * Birmingham and Warwick Junction Canal – bought by the Regent's Canal in 1927 * Grand Junction Canal – bought by the Regent's Canal in 1927 ;Leicester Line * Old Grand Union Canal – bought by the Grand Junction in 1894 * Leicestershire and Northamptonshire Union Canal – bought by the Grand Junction in 1894 * Leicester Navigation – bought by the Grand Union in 1932 * Loughborough Navigation – bought by the Grand Union in 1932 * Erewash Canal – bought by the Grand Union in 1932 A 5-mile (8-km) section of the Oxford Canal forms the main line of the Grand Union between Braunston and Napton. Although the Grand Union intended to buy the Oxford Canal and Coventry Canal, this did not take place. The section of the main line between Brentford and Braunston (formerly the Grand Junction Canal), was built as a 'wide' or 'broad' canal – that is, its locks were wide enough to accommodate two narrowboats abreast (side by side) or a single wide barge up to 14 feet (4.27 m) in beam. However, the onward sections from Braunston to Birmingham had been built as 'narrow' canals – that is, the locks could accommodate only a single narrowboat. An Act of Parliament of 1931 was passed authorising a key part of the modernisation scheme of the Grand Union, supported by Government grants. The narrow locks (and several bridges) between Napton and Camp Hill Top Lock in Birmingham were rebuilt to take widebeam boats or barges up to 12 feet 6 inches (3.81 m) in beam, or two narrowboats. The canal was dredged and bank improvements carried out: the depth was increased to 5 feet 6 inches (1.68 m) to allow heavier cargoes, and the minimum width increased to 26 feet (7.92 m) to enable two boats of 12 feet 6 inches to pass. Lock works were completed in 1934 when the Duke of Kent opened the new broad locks at Hatton, and other improvements finished by 1937. However, these improvements to depth and width were never carried out between Braunston and London. Camp Hill Locks in Birmingham were not widened, as it would have been very expensive and of little point, since they lead only to further flights of locks not in the ownership of the Grand Union. A new basin and warehouse were constructed at Tyseley, above Camp Hill, to deal with this. Although the Grand Union company had a number of broad boats built to take advantage of the improvements, they never really caught on and the canal continued to be operated largely by pairs of narrow boats, whose journeys were facilitated by the newly widened locks in which they could breast up. The three sections between Norton junction and the River Trent (collectively known as the 'Leicester line') are mixed in size. From Norton to Foxton, the route is a narrow canal. From below Foxton to Leicester it is a wide canal. From Leicester to the Trent, the route is effectively the River Soar and the locks and bridges are wide. Another Act of 1931 authorised the widening of the locks at Watford and Foxton, but with Government grants for this section not forthcoming, the work was not carried out. The Grand Union Canal was nationalised in 1948, control transferring to the British Transport Commission, and in 1962 to the British Waterways Board, later British Waterways. Commercial traffic continued to decline, effectively ceasing in the 1970s, though lime juice was carried from Brentford to Boxmoor until 1981, and aggregates on the River Soar until 1996. However, leisure traffic took over, and the canal is now as busy as it ever was, with leisure boating complemented by fishing, towpath walking and gongoozling. More recently freight traffic has returned with the carriage of aggregates from Denham to West Drayton in barges and narrow boats, and the opening of a new wharf for re-cyclables and aggregates at Old Oak Common. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Grand Union Canal」の詳細全文を読む スポンサード リンク
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