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Turnouts facing and trailing. Note that this diagram is for left-hand traffic; for right-hand traffic, "F" and "T" would be swapped. Facing or trailing are railway turnouts (or 'points' in the UK) in respect to whether they are divergent or convergent. When a train traverses a turnout in a facing direction, it may diverge onto either of the two ...
Double junction, or level junction (left hand running). A double junction is a railway junction where a double-track railway splits into two double track lines. Usually, one line is the main line and carries traffic through the junction at normal speed, while the other track is a branch line that carries traffic through the junction at reduced speed.
Double trap points are a full turnout, leading to two tongues. Usually the tongue nearer the main line is longer than the other. Trap points with a crossing are double trap points where the tongues of rail are longer, so that the trap point rail nearest the main line continues over the siding rail with a common crossing or frog.
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.
Turnout Aspects / Add-on Indicators: Turnout Left Clear Train must slow for turnout to the left after signal - - † † † † † Turnout Right Clear Train must slow for turnout to the right after signal - † † † Turnout Left Advance Caution Train must slow for turnout to the left after signal; expect stop after one more signal ...
The left hand signal then controls the left-hand track, and the right signal the right-hand track. A gantry or signal bridge may also be used. This consists of a platform extending over the tracks; the signals are mounted on this platform over the tracks they control.
It directs standard-gauge rolling stock from the common rail in the left foreground to the right-hand rail in readiness for the turnout in the distance. [p] 1600 / 1435 / 1067 mm (5 ft 3 / 4 ft 8 1 / 2 / 3 ft 6 in).
This sign aside a railroad (between Ghent and Bruges) indicates the start of the transition curve. A parabolic curve ( POB ) is used. A transition curve (also, spiral easement or, simply, spiral ) is a spiral-shaped length of highway or railroad track that is used between sections having different profiles and radii, such as between ...