When a train takes the wrong route at a junction, how does that happen? Isn the route preprogrammed or does the operator choose his/her route themselves?
How it is that a train can take the wrong “line-up” — a particular alignment at a junction leading to a route — depends somewhat on what junction it is and how the junction is controlled. In the case of 59th Junction (where the Green Line branches on the South Side) and Loomis Junction (where the Blue Line splits on the Near West Side), the junctions are set automatically to sort every other train to each branch. Generally, the only way a train can be incorrectly routed is if two trains destined for the same branch arrive consecutively (such as two Forest Park branch trains in a row), perhaps because a trip (say, to 54/Cermak) was annulled. In this case, the operator would need to stop at the wayside route selector before the switch and manually set his route; failure to do so would send him onto the wrong branch. In the case of very busy locations with irregular train movements, such as Tower 18 (the northwest corner of the Loop at Lake/Wells), Clark Junction (where the Red/Purple a
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