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A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.
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 ...
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
The driver of a train approaching a diverging junction needs to know which route the train will take, so that its speed can be regulated accordingly. A diverging route might have a significantly lower permissible speed than the main route, and if the route taken was not the one expected, it could result in derailment.
Track circuits can automatically detect some types of track defect such as a broken rail. In the event of power restoration after a power failure, an axle counted section is left in an undetermined state until a train has passed through the affected section. A track circuited section immediately detects the presence of a train in section.
A railway track (CwthE and UIC terminology) or railroad track (NAmE), also known as permanent way (CwthE) [1] or "P Way" (BrE [2] and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers (railroad ties in American English) and ballast (or slab track), plus the underlying subgrade.
Aspect 1 : The track ahead is clear. The train is permitted to travel at any speed up to the current line limit. Aspect 2 : Max speed 40 km/h for the points in diverging position Aspect 3 : Max speed 60 km/h for the points in diverging position. Takes precedence over line limits. Aspect 5 : Max speed 90 km/h for the points in diverging position.
Signal 21 – Proceed (to diverging route) The train can proceed, usually via one or more diverging switches. Station entry signals, station exit signals, inner signals. Signal 22 – Proceed: The train can proceed, not via diverging switches. Station entry signals, station exit signals, inner signals, block signals.