Platform sharing & permissive working

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Permissive working is not permitted for moves under a main aspect. However, using a call-on route, a passenger train can enter an occupied section under a subsiduary aspect and their exit signal is effectively the obstruction (i.e tail light, back end of train, buffer stops, other red aspect in the route).

Here are some homework questions for you:
1) what is the difference between a warner, call-on, main and shunt route?
2) which type of route in 1) can a passenger train not use?
3) which type of route in 1) can a freight train not use?

Answers to this forum within five days please (except for PJW).

Jerry

1) main route:
main aspect entrance signal
main aspect exit signal
full overlap

warner route:
main aspect entrance siganl
main aspect exit signal
overlap can be reduced to 50m dependant on the amount of delay applied to the approach control of the entrance.

call on route:
entrance= PLG associated with a main aspect showing two white lights at 45 Degrees.
no exit signal (train)
no overlap
used under permissive working so track section to be occupied in route.
speed to be limited to stopping distance.
approach control of entrance to bring train to a stand before a movement aurthority is given.

shunt route:
entrance= PLG two white lights 45 deg
exit= PLG two red
overlap can be reduced to 47m
not permitted for passenger moves. (answer2)

3) ?????freight trains cannot use call on routes?????
i can't think of any benefits in allowing a freight train to approach an occupied passenger platform.


wasn't sure how much detail you were looking for, this is just a quick sum up.