The set-up for this game doesn't make any sense. Lily is apparently trapped because one of the exits from Grimwood station is blocked due to a landslide triggered by an earthquake. In those circumstances, the train would terminate at Grimwood then return back in the direction it came, since most modern trains can travel easily in either direction. So why didn't she just stay on the train and return back the way she came. Apparently she'd missed her stop, so by returning the way she came, she wouldn't have to go home at all, just back to the stop she was intending to get off at.
For the earthquake to block both exits, they would have to have been stopped at the station, whilst the earthquake was actually happening. And it would probably have to have taken place in the Grimwood area itself, in which case the whole town would be a mess, which it isn't. And I'm pretty sure Lily would have been aware of it, and not slept through the whole thing? Therefore the earthquake must have happened some distance away, further up the line, and the direction she came must still have been open.