Stations undergoing maintenance or upgrading may have certain exits closed or even temporary platforms that change as the project goes on. Here in Chicago, the Red Line is undergoing a major rebuild that started over 2 years ago and will not be completed until 2025. Temporary stations have been set up at multiple stops, with different entrances that have changed as the project has gone on [1].

It may have only changed a few times over the last 2 years, but it's certainly a rude awakening when you're running to catch the train and you find out your stop is now a block away from where you thought it was.

0: https://www.transitchicago.com/redahead/

1: https://www.transitchicago.com/ctas-red-and-purple-moderniza...