(13-09-2010, 08:29 AM)Jerry1237 Wrote: Splitting tracks in stations is normally there to allow seperate detection of a specific length train (also read about Lime Street control).
As for the distances shown by the arrows for distances between signals, the are signal centreline to signal centreline. Usually, the distance and signal ID are shown.
Have you a scale rule? If not buy one. Sometimes they give one out in the exam but don't presume they will. Get used to using one and be careful of scale changes (not usual in the exam!).
Jerry
Module 3 layputs are not to scale but are generally (within any given area) proportionate and hence dimensions for one direction can be assumed applicable to the other or a distance estimated as a proportion of a defined one.
Generally the distance from one running signal to the next is given, but occasionally the standage between two opposite direction signals, as at platforms.
Don't forget that when using platfrorm tracks t time out overlaps / opposing locking that it is the combined length of time that one or other of the platform tracks is occupied that is important; you probably don't even need to consider their individual lengths
PJW