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The Narrow Gauge Railway Museum
We are an independent charitable organisation dedicated to the collection, conservation and display of narrow gauge railway relics and material for the education of the public.
http://narrowgaugerailwaymuseum.org.uk/museum/
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Rail Gauge - The Transcontinental Railroad
The Linda Hall Library Transcontinental Railroad website was created with generous support from the BNSF (Burlington Northern Santa Fe) Foundation. The site offers visitors a brief history of the building of the transcontinental railroad as well as information on the history and technology of 19th century railroads.
http://railroad.lindahall.org/essays/rails-guage.html
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The Maine Narrow Gauge Railroad Company and Museum
The Maine Narrow Gauge Railroad Company & Museum is dedicated to the preservation of Maine's two-foot gauge railways for the education and enjoyment of the public. The museum is open mid-May to mid-October and seasonally for special events.
http://www.mainenarrowgauge.org
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Official Durango & Silverton Narrow Gauge Railroad Train
The D&SNGRR is history made up of original equipment, maintained to perfection, operated and kept up by people today using skills long lost to ordinary endeavors.
http://www.durangotrain.com
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Why is the Standard Gauge on a Railway 4ft 8.5inches? - The Guardian
IN THE 18th century, when primitive waggonways were developed for horse haulage, measurements were often made to the nearest quarter-inch and precision engineering spoke of 'bare eights'.
http://www.theguardian.com/notesandqueries/query/0,5753,-1533,00.html
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Broad Gauge Society
The Broad Gauge Society was formed in 1980 to promote research into, and the modelling of, the 7' 0¼" broad gauge railways of Great Britain.
http://www.broadgauge.org.uk
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Single-Track Railway - Wikipedia, the free encyclopedia
A single-track railway is a railway where trains travelling in both directions share the same track. Single track is usually found on lesser-used rail lines, often branch lines, where the level of traffic is not high enough to justify the cost of constructing a second track.
https://en.wikipedia.org/wiki/Single-track_railway
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Track Gauge - Wikipedia, the free encyclopedia
In rail transport, track gauge is the spacing of the rails on a railway track and is measured between the inner faces of the load-bearing rails.
https://en.wikipedia.org/wiki/Track_gauge