[This message has been edited by Boyce (edited 12-04-2003).]
Let's say a siding can hold a train of 120 cars. Say the dispatcher desires to give priority to a train (possibly with a crew getting short on time) heading, say, Eastward to both run around an Eastward train (with, say, a fresh crew) and "meet' a Westward train. Say the Eastward train to be run around is a freight 100 cars long; say the Westward train to be "met' is an Amtrak passenger 10 cars long.
What will happen is the Eastward freight being run around will enter the siding stopping so that only the Western switch point is cleared. There is still 20 cars of "room" (120-100=20). The Westward Amtrak 10 cars long will now pull into the siding and after clearing the Eastern switch point it is now time for the nursery rhyme of "What was it the engines said, touching pilots head to head".
The Eastward freight with priority comes and goes.
Now, the Amtrak passenger will back up and reenter the Main Line through the Eastern switch point and get on its way Westward until it is time for some other delay to occur The secondary Eastward freight now gets on its way entering the Main Line through that same Eastern switch point.
OK, school's out. Homework; anybody care to describe a "sawbuck' switch move?
[This message has been edited by Gilbert B Norman (edited 12-04-2003).]
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Trust God, love your neighbor, and never mistake opinion for truth.
-Mr. Toy
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JONATHON D. ORTIZ
We'd just pulled into the station at Malta, Montana. The attendants were getting ready to open the doors -- until the conductor announced a slight change of plan.
The westbound Empire Builder, way behind schedule, was evidently approaching Malta. From the sound of it, a snap decision had been made to give it the right of way.
So our train shifted into reverse, backed out, and moved onto a siding.
The westbound Empire Builder entered the station, quickly took care of business, and departed. Once it had completely rolled past us, we pulled into Malta a second time.
It was not as complicated as what Mr. Norman described. It was a matter of not using the west end siding switch back to the main, but using the east end switch both times (don't know why)
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Trust Jesus,Ride Amtrak.