Point to Point Double Tracked System
N Scale layout for a 3' by 6' layout ...
Double Track
A railway route in which one track is provided for each direction of travel.
Down Line ...
double track railway usually involves running one track in each direction, compared to a single track railway where trains in both directions share the same track.
Overview
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Double Track
(DT) Two main tracks, on one of which the current of traffic is in a specified direction, and on the other in the opposite direction.
Doublehead ...
Double Track
Parallel sets of main line tracks typically found in areas with high densities of traffic
Double-Stack ...
Double Track
Two main tracks, one of which the trains run in one direction and the other in the opposite direction.
Dozer ...
The Double Track (DT) variation of the TWC scheme is used to create locations where easy meets may take place. Since all switches in dark territory are hand thrown, trains need to stop to reverse or normalize a switch.
Double Track A term used to describe the type of track system used on the majority of LRT systems. Each track is separate and carries an LRV in one direction. When double tracks are used, tracks are usually delineated as: ...
The South Shore was double track from Kensington to just east of the Gary station and single track from this point east to South Bend. At one time up to the early 80's, the crossing and connection to the IC/ICG was double track.
A length of double track where trains can pass each other, on a railway line which is mainly single track. Alternatively, a length of additional track alongside the main line, allowing faster trains to pass slower trains.
If the main line is double track, there have to be crossovers to allow trains into the yard. Also, the receiving tracks must be located so that access from the main does not block yard leads.
I live beside the old Western Maryland Railway mainline and went out and measured its prototype double track centers, which, when scaled down to HO came out to exactly 2", within a few thousandths of an inch.
A mile of railroad without regard to the number of tracks on that line. An 85-mile-long double track railroad has 85 route-miles but 170 track miles not counting sidings, spurs, and yards.
RPO ...
Because the beam of the emitter widens as the distance increases, one emitter group could cover several tracks. For example a double track main or a yard throat would only need one set of emitters for a group of detectors that are close together.
Dog bone A continuous run layout where the two sides of the circle have been "squeezed" together so as to simulate double track. A train running on this type of layout will appear to be running backwards and forwards in a realistic manner.
Double Track - A two track railroad.
Down grade - American term for a down-hill grade.
DPDT - Double pole, Double Throw.
 See also: Double, Track, Train, Point, Engine
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