Sometime in the last 20 years, there was an article about UP running out of car numbers with the initials of their current names.
To solve this, UP revived the use of its predecessor freight car number series for use on its freight car fleet. My understanding was that these predecessor numbering series were being applied to new freight cars that had no relationship with the predecessor RRs.
I don’t know if BNSF, NS, CSX, CN, or CP have also used predecessor freight car number series on new freight cars.
