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2. B & O Railroad Potomac River Crossing - Wikipedia

   en.wikipedia.org/wiki/B_&_O_Railroad_Potomac...

   This was complemented in 1930–1931 with a deck plate girder bridge that carried the B&O Main Line (now the CSX Cumberland Subdivision) to Martinsburg, West Virginia. A rail tunnel, known as the Harpers Ferry Tunnel, was built at the same time as the 1894 bridge to carry the Valley Line through the Maryland Heights, eliminating a sharp curve ...

3. OO gauge - Wikipedia

   en.wikipedia.org/wiki/OO_gauge

   OO gauge or OO scale (also, 00 gauge and 00 scale) is the most popular standard gauge model railway standard in the United Kingdom, [1] outside of which it is virtually unknown. OO gauge is one of several 4 mm-scale standards (4 mm to 1 ft (304.8 mm), or 1:76.2), and the only one to be marketed by major manufacturers.

4. The Biggest Little Railway in the World - Wikipedia

   en.wikipedia.org/wiki/The_Biggest_Little_Railway...

   Following nearly ten miles of good fast track the line crossed to the south bank at Laggan Locks over a truss bridge. The line joined the path of the Invergarry and Fort Augustus Railway through the Loch Oich tunnel and along the shoreline to cross the Calendonian Canal at the Aberchalder Swing Bridge. Five miles of fast straight track to Fort ...

5. List of bridge–tunnels - Wikipedia

   en.wikipedia.org/wiki/List_of_bridge–tunnels

   a bridge–tunnel carrying monorail Great Belt Fixed Link: 1997 Denmark Zealand and Funen Great Belt: includes a railway tunnel, bridge–tunnel transition uses natural island Øresund Bridge: 2000 Denmark/Sweden Copenhagen and Malmö: Øresund/Öresund: includes a railway tunnel Shanghai Yangtze River Tunnel and Bridge: 2009 China

6. Minories (model railway) - Wikipedia

   en.wikipedia.org/wiki/Minories_(model_railway)

   It also justified the popular, but sometimes contrived, technique of a tunnel exit to the off-board fiddle yard. Fiddle yards, and their use for the "Fiddle Yard to Terminus" layout, were themselves a technique earlier popularised by Freezer. [1] [3] British railway modelling of this period was almost entirely OO gauge [citation needed].

7. Rail transport modelling - Wikipedia

   en.wikipedia.org/wiki/Rail_transport_modelling

   British OO standards operate on track significantly too narrow. The 4 mm/1 foot scale on a 16.5 mm (0.65 in) gauge corresponds to a track gauge of 4 ft 1 + 1 ⁄ 2 in (1,257 mm), 7 inches or 178 millimetres (undersized). 16.5 mm (0.65 in) gauge corresponds to 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge in H0 (half-0) 3.5 mm/1 foot or 1:87.1 ...