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The tracks are entirely grade-separated and have a generous loading gauge of 3,660 mm (12 ft 1 ⁄ 8 in) width and 7,100 mm (23 ft 3 + 1 ⁄ 2 in) maximum height allowing for the double-stacked shipping container on flatcars to be transported, in contrast to wellcars used in other countries for double-stack rail transport. [57]
In any given country, rail traffic generally runs to one side of a double-track line, not always the same side as road traffic. Thus in Belgium, China, France (apart from the classic lines of the former German Alsace and Lorraine), Sweden (apart from Malmö and further south), Switzerland, Italy and Portugal for example, the railways use left-hand running, while the roads use right-hand running.
Each unit of a double-stack car contains a single well; they often are constructed with three to five cars connected by articulated connectors. The intermediate connectors are supported by the centerplate of single trucks, often a 125-short-ton (112-long-ton; 113 t)-capacity truck but sometimes a 150-short-ton (134-long-ton; 136 t)-capacity one.
Converting a single-track railway to double track is called duplication or doubling; converting double track to single track is known as singling. A double-track railway operating only a single track is known as single-line working. Kirkby railway station (until 1977) and Ormskirk railway station (until 1970) were double-track railway, when ...
This zigzag stack is often identified as a double-column or double-stack (The double-stack is much more common because of its ability to store more rounds), since a staggered column is actually two single side-by-side vertical columns offset by half of the diameter of a round. As the firearm cycles, cartridges are moved to the top of the ...
A double chimney (or double stack, double smokestack in American English) is a form of chimney for a steam locomotive, where the conventional single opening is duplicated, together with the blastpipe beneath it. Although the internal openings form two circles, the outside appearance usually forms a single elongated oval.
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Converting a double-stack container train to single stack by removing the top layer of containers, allowing the rest of the train to proceed along track that lacks double stack clearance. The removed containers can be trucked to local destinations.