I want to know more about that tractor!   It's a long ways from being a 35-45-55 Challenger...that's more like an MT undercarriage, and the only part of the base machine that looks similar to them is the cab.  The lighting makes me think it has some European lineage.   I have seen (poor) pictures of a blue one in the NewHolland days...figured it was a blue row crop but the pictures were not good enough to say it was not this one.