I am definitely getting the Grain Train 4-pack. However, one of the road numbers appears to be technically the same as one used in a previous release of the 4-pack. An earlier 4-pack had these cars with their original Blue Mountain Railroad (BLMR) reporting marks, and the 4-pack I have included BLMR 1008, BLMR 1015, BLMR 1019 and BLMR 1022. The original Blue Mountain Railroad reporting marks were patched over with the Columbia Basin Railroad (CBRW) reporting marks. I compiled the table below from various online sources about five years ago, so I don't know who should get the credit for it.

As shown in the table, all of the cars had the CRBW reporting marks by the end of 2004, and probably a lot earlier than that. I have been hoping to find or make decals to patch the four cars I currently have with the BLMR reporting marks to CBRW reporting marks for my 2006 modeling era. Since one of the cars in this new release will be CRBW 1015, it will complicate my attempt to patch BLMR 1015.
So Joe, can another road number that doesn't duplicate a road number that Micro-Trains has already released for the Grain Trains covered hoppers be used in place of CRBW 1015!