Please Please Help Me Name This Track!

beccabiscuit

I have heard a track at college I am desperate to know what it is called and who the artist is.
: It's chill out ish instrumental and it has a heavy guitar tune throughout the middle section.
:It starts off with the sound of a train chugging along tracks and ends with the same sound.
:It could be dj shadow but it might not be.
:An electric and acoustic guitar kicks in after the train sound and soon after a marchy drum beat.It builds then gets quieter ending with the sound of the train going along tracks.
: It sounds a bit Indie so i thought it could be an indie tune remixed or something. I have searched loads of times on google and artists on amazon.com but havn't had any luck.
:I'v also heard on the television but can't remember what for! I think it may be a soundtrack for something but am not sure

Please please help me name this tune!
Thanx
Rebecca