TORCO was home to the last CSX (Chessie) SD35s and either leases or purchases older CSX units on their last legs for service on the docks. This has been standard practice for at least 20 or 30 years, long enough that before CSX the units kept Chessie paint. Occasionally the units get mis-routed or swapped out and you see them in strange places - I saw one in Syracuse NY a number of years ago.
Some lease outfits do paint their locomotives - EMD, Helm, Morrison-Knudsen (defunct), First Union Rail, and at least one other outfit had units painted in their own schemes. In the case of Helm, they had CSX overhaul some units which got painted solid dark blue, after they'd used a scheme of a brighter blue and purple in the past. FURX units are green and silver, then to save a buck the last group they had overhauled just got primer.