Front Range Sub Traffic - Help

My Wife & I are visiting Colorado later this year and want very much to photograph Trains on South Mason Street (Fort Collins).
We do not have a lot of time available in our schedule so could someone kindly advise what time of day we are most likely to see a train ?
I understand that there is a daily (both ways) Denver / Laurel Train – does anyone know what times they usually pass ?

Thanks
Stuart
Stratford on Avon
England