Lead Track

Lead track. An extended track connecting either end of a yard with the main track.
Lens, switch lamp. A lens set in a switch lamp. A wide-angle lens, which spreads a light of low intensity over a wide area, is most commonly used with yard switches.

Lead Track
Trackage connecting a yard with the mainline.
Lichen
A moss-like plant which, when dried, preserved with glycerine, and dyed, is commonly used as a scenic decoration to simulate foliage, brush and undergrowth on model railroad layouts.

Lead Track - Trackage connecting a yard with the main line.
Level Crossing - Crossing of two railways, or a railway and road, on the same level.

The cars he was cutting away from were sitting on lead track on a slight grade, a grade that descended towards a road crossing and into an industry. He neglected to apply handbrakes and this was a serious mistake.

The only other factor would be: When the train is entering the loop from the lead track; to allow enough time after Q1 is uncovered for the delay associated with IC 1B to run out and for the 2200uF capacitor to charge before the train reached Q2.

If there is only a single yard with a single lead track (which is what most of us have to do because of space limitations), then it should be clear that putting together one or, at most, ...

See also: Operation, Track, Switch, Car, Yard