i found this on youtube and omg i was dying. At first it seems like a cheesy kids cartoon then it "Transforms" into a badass vid. Theres a whole series and they are all awesome TRAINS-FORM3RS - YouTube you can hear remixed versions of transformers scores in the background
... and google agrees. I remember watching these guys on the Shining Time Station clips with George Carlin as Mr Conductor (yep!), but it's been a while, so I thought maybe his character was representing Bonecrusher or something in the parody because of the arm thing.
I just love how this combines Transformers, Thomas the Tank Engine & Power Rangers (3 things i grew up with) with the innocence & naivety of a child.