Train stations may or may not be as big as airports, but they share the same obstacles. Trains are long, so platforms have to be long. Some train platforms are raised above the level of the tracks, so remember the rules from the subway lesson. Locate the platform edge, and respect it. Do not step sideways.
Bus stations range in size from a driveway beside a small-town drug store to a city block or more.
In bus stations, you need to get to the right boarding gate, and there is often a loud noise when you get there. Sometimes the distance from the boarding gate to the bus door is short and obvious, and you can find it easily. If you know where to go, then go ahead. Remember Rule One. If you don't know where to go, ask for help.