There could also be new characters introduced in the fanfic. Maybe a new mentor figure who guides Harry in his training. This character could have unique magical abilities and knowledge that they pass on to Harry. Another possibility is an antagonist who tries to disrupt Harry's training for some reason, adding conflict to the story.
One interesting aspect could be the character development. In fanfics, authors often explore different sides of the characters. Maybe in 'harry potter trains hard fanfic', we get to see Harry Potter training in ways that were not shown in the original books, like developing new spells or combat skills. This can give a fresh perspective on his growth as a wizard.
I'm not sure specifically as it depends on the author of the fanfic. But it could include the classic Harry Potter characters like Harry, Hermione, and Ron. They might be on the train for some special reason related to their fight against Voldemort or some other new threat.
Harry is the central figure, but there might be some new characters introduced in the fanfic. For example, an old wizard who lives on the outskirts of Hogwarts and has some unique knowledge about magic that Harry discovers. This character could become a sort of mentor, even if from a distance, as Harry trains himself using the knowledge he imparts. Also, there could be antagonists like some students who are jealous of Harry's self - improvement and try to disrupt his training.
Well, one interesting aspect could be the unique take on the Hogwarts Express. Maybe it's given some extraordinary abilities or a different role in the fanfic's plot. For example, it could be a magical portal to other dimensions rather than just a means of transportation to school.
One interesting plot could be Harry finding unique ways to practice magic in isolation. For example, he might discover a hidden corner of the Hogwarts grounds where he can train without distractions. He could be experimenting with spells that are not typically taught in class, pushing the boundaries of his magical abilities.
One possible plot could be that Dr Strange is summoned to Hogwarts to train the students in advanced magic. He starts with Harry Potter, teaching him how to better control his magic and use it in more creative ways, like using time - based spells.
Yes, there are some really interesting 'Dr Strange trains Harry Potter' fanfics. You can find them on various fanfic websites. Some explore unique magical concepts by combining the two universes, like how Dr Strange's magic could influence the way magic is taught at Hogwarts.
I'm not sure specifically as I haven't read that particular fanfic. But it might be about a character named Harry who has some sort of experience related to three trains. It could be an adventure where the trains play a major role in training Harry, perhaps in a magical or extraordinary world.