The main character is surely the girl on the train. There may also be other passengers or train staff that could be considered important characters depending on the story.
Well, in 'the girl on the train short story', often the girl's perspective on the train is central. She might be traveling to a new place or just commuting. Along the way, she could be noticing the scenery outside, the other passengers in the train. There might be some sort of interaction or just her own musings about life as she watches the world pass by through the train window.
The 'The Girl on the Train' is a thriller story. It mainly follows the perspective of a woman who takes the train daily. She becomes involved in a mystery when she witnesses something strange from the train window. As she tries to figure out what she saw, she gets entangled in a web of lies, secrets, and danger.
The 'Girl on the Train' is not a true story. It's a creation of the author's imagination. However, it might draw inspiration from common human experiences and emotions, but it's not a factual account.
She could have met an interesting person on the train and had a great conversation. For example, she might have met a kind old lady who told her some amazing stories from the past. This would not only make the journey more enjoyable but also give her some new perspectives on life.
I'm not entirely sure as I haven't specifically read the 'The Girl on the Train 2021' story. But generally, stories with such titles often revolve around a girl who has some sort of journey or experience related to a train. Maybe she meets interesting people during her train rides, or there could be some mystery or drama associated with her travels on the train.