- published: 29 Aug 2015
- views: 1634
A grand union is a rail track junction where two double-track railway lines cross at grade, often in a street intersection or crossroads. A total of sixteen railroad switches (sets of points) allow streetcars (or in more rare installations, trains) coming from any direction to take any of the three other directions. The same effect may be achieved with two consequent wyes if the location allows for space.
These types of complex junction are expensive to build and expensive to maintain. Special parts, sometimes made of manganese steel, are needed for each location where one rail crossed another (a "frog"); these parts often need to be custom-made and fitted for each single location, depending on the specific angle of crossing of the intersecting streets.
A full grand union junction consists of 88 frogs (where one rail crosses another rail), and 32 switchpoints (point blades) if single-point switches are not used. A tram or train crossing the junction will encounter four or twenty frogs within the space of crossing the junction.
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. It has arms to places including Leicester, Slough, Aylesbury, Wendover and Northampton.
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.
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:
Narrowboating, Grand Union Canal, Summer 2015
12. A narrowboat cruise on the Grand Union Canal, to Braunston
Grand Union Canal - Watford Lock Flight
Grand Union Canal in the 1930's. Film 8598
Old Grand Union Canal (History Documentary 2013)
Gravenhurst - Grand Union Canal
Mark Woolley angler - 2014 Blog 3 - Grand union canal with Steve - Carp fishing
Grand Union Canal - Marsworth to Tring Summit
Narrowboat Timelapse on The Grand Union Canal - Uxbridge to Yeading.
CARP FISHING TIPS NASH JACK BROWN GRAND UNION CANAL CARPING MAGMA GLUGS CLING-ON LEADER
i've walked every street in this city
i can't find a way out
beyond these walls
a clarion call
'find a way out'
i have burned every bridge in this city
trying to get to you
while you are waiting for me
by a copper-blue sea