I recently came across another set of those 94' tank cars and found
a variation in the 3111 CITGO.
The difference is in the CITGO logo. Of the two I have, one has
black lines inside the red triangle and the other doesn't.
I do not see any other variations in the other three tank cars.
I do have several other cars I have found variations in, which I
will post as time permits (it a busy week in the meat industery
right now [my line of work]).
Edward Bridges
Granger, TX