It’s an open station, with only one person sitting on a bench far away, waiting for a train. The protagonist doesn’t remember how he ended up here or where he is.
As the rain starts, all memories and feelings flood his mind, only to fade away like a passing train.
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Using the perspective and deep space of platform is a wise choice. Moving train vs still protagonist could create some dramatic moments, as long as his/her vibe is related to the commute or farewell.