Tommy and his SRC's ponder a rail oddity

RAY: My brother has always been a keen observer of people and surroundings. Lately, he's taken to hanging around the train yard, where the guys are hanging out with the big barrels with the fires in them, roasting squirrels.

Not much changes from day to day. Trains come and trains go, cars get loaded and unloaded, sometimes cars get taken and sometimes cars get added. After a few days, Tommy begins to notice something odd — a pattern, so to speak. Just about every freight train that enters the yard seems to overshoot its intended target. The engineer then puts the engine in reverse and moves the entire train backwards some distance. It's hard to believe the engineers could miss their targets with such regularity, especially considering how excruciatingly slowly the trains are moving.

None of Tommy's SRCs — Squirrel Roasting Comrades — can come up with an explanation. But, there is one. What is it?

Think you know? Drop Ray a note!

[ Car Talk Puzzler ]