23-08-2011, 08:30 AM
@fil
Basically, yes. I believe there are a couple details that differ between our answers.
1)
Main - route from main aspect to main aspect with full overlap.
Warner - main aspect to main red aspect (at time of release?) with reduced overlap and approach release
Call-on - PLI to clear of obstrution or red aspect, permissive move with effectively no overlap.
Shunt - Non-passenger move (2) from PLI to clear of obstruction or red aspect with potentially no overlap.
Only other comment I'd make is about speeds. With main aspects the speed is what is appropriate but not exceeding the local speed restrictions or speed of the line, whichever is greater. With the rest, shunt is walking pace (<15mph!) and warner/call-on/shunt mandate such a speed as to be able to stop the train clear of any obstruction, i.e. with caution (if you read a lot of accident reports for yards, approaches to terminals etc., caution is often not exercised).
3) Why can't non-passenger trains use a call-on? Imagine a station used for berthing trains overnight. An MPV turns up and needs a turnback move. Possibly no shunt move available... (PJW or Peter may correct me on this).
4) Level of detail is whatever is appropriate for you. Our hope is that people learn from the forum by asking even the most daft question and then researching the answer or getting peer advice. Good to see someone rising to a challenger. Well done.
Jerry
Basically, yes. I believe there are a couple details that differ between our answers.
1)
Main - route from main aspect to main aspect with full overlap.
Warner - main aspect to main red aspect (at time of release?) with reduced overlap and approach release
Call-on - PLI to clear of obstrution or red aspect, permissive move with effectively no overlap.
Shunt - Non-passenger move (2) from PLI to clear of obstruction or red aspect with potentially no overlap.
Only other comment I'd make is about speeds. With main aspects the speed is what is appropriate but not exceeding the local speed restrictions or speed of the line, whichever is greater. With the rest, shunt is walking pace (<15mph!) and warner/call-on/shunt mandate such a speed as to be able to stop the train clear of any obstruction, i.e. with caution (if you read a lot of accident reports for yards, approaches to terminals etc., caution is often not exercised).
3) Why can't non-passenger trains use a call-on? Imagine a station used for berthing trains overnight. An MPV turns up and needs a turnback move. Possibly no shunt move available... (PJW or Peter may correct me on this).
4) Level of detail is whatever is appropriate for you. Our hope is that people learn from the forum by asking even the most daft question and then researching the answer or getting peer advice. Good to see someone rising to a challenger. Well done.
Jerry
Le coureur