Do just as Rick & thudmaster have suggested, appeal it! I would include a photo of your car and an explanation of what CSX4236 represents. Someone a DMV was just having a bad day, they are notorious for passing just about anything, for the revenue!
If you can locate one of the other CSX numbered plates that have already been issued and get a photo of it on the car, I'm sure that would help a lot. I have personally seen many of them. Trust me when I tell you that they have approved many, very questionable plates.
Good luck, appeal it!
jdog
P.S. Please keep us posted, I will be ordering plates for CSX4795 in Jan.