Atlas, though, has been known to use the last 2 digits of the locomotive number for the address. Example, Western Maryland RS3 #189 was programmed to address 89 when i got it.
The Atlas 'preprogrrammed' address happened when they came out with their 'Commander' DCC system, and didn't last long. It confused people who didn't read the box and expected address 3 when they first put it on the track. Also, DCC systems that could support 4 digit addressing, unlike the Atlas 'Commander', were coming out and people wanted to use the entire road number. Not just the last two digits.
Len