that was really cool man. great music choice.
-play with your color grading a little more. you're inside a house, and therefore your lighting is meh. this means that you have to really give your footage a unique look in order to avoid having a 'home video' feel. it just takes practice though.
-try sequencing the shots more to tell a story. i could definitely tell there already is a story, but it could be even more continuous. that is, the shots of the train going around the track seemed a little haphazard. you could have shot it so we really got the sense that we were watching it make one loop without the train suddenly changing which part of the track it's on. i'm having a hard time explaining what i mean, hopefully you understand.
-i really, really loved that last shot. personally, i would have like to have seen the whole thing be made out of shots like that. make it feel like the viewer is part of the miniature world of the train, not just a person watching a toy train go around a track.
but really nice, i enjoyed it. those are just some things to keep in mind for the future.