Wow very cool pics. I really like the 2nd one (black one with the horse). Would like to buy a model version of that if there is one. Maybe you can recommend me an online store?
To the OP, would I be correct in believing 6928 is a GP20?. I see that this shot was taken just this month, that's quite interesting. I have just recently bought a UP GP20 (P2K) HO model, the prototype of which was scrapped in 1984. Fascinating to see one still in use. Do you know if CSX have many of them?
To Cj, what indicates to you that the GP30 is a fuel tender or slug. If a tender, does that mean it's engine etc has been removed and replaced with extra fuel tanks?
Oh, and that Transcorp hopper gives me encouragement to start weathering my equipment, if it looks roughly hand painted then I can't go wrong then.