When the sound of the choochoo train comes in, I think it gets loud too fast - you can slow down the rate of boost easily.   I love the opening, btw - when the music comes in, and the train sounds continue, that's wonderful. 
There's too much reverb on the vocal when it comes in.  It needs to be louder/dryer.  I can't make it out clearly enough.  It needs to be more present.
The guitar solo: cut some low mids.  Cut some lows.  
I really like this tune.  Make it sound better.
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