Here’s my plan …
1. Quickly try boosting myself back up onto the platform, while I don’t count on somebody helping me, I’ll shout out for a hand — some people need to be told what to do! The track well is deeper than it looks.
2. Shelter between the train and the platform overhang if there is lots of space. There usually isn’t.
3. My best bet: Jump the 3rd rail and take shelter between two sets of tracks or in the niches/alcoves in the wall opposite the platform.
4. Lie flat between the tracks — hoping the train will pass over me. The depth is uneven, often crowded with switch equipment. Last resort.
When the track is clear, walk to the nearest end of the platform to the steps which will bring me back up to the platform level.