Rackoholic,
I looked in the "Maintenance Manual and Spare Parts List" I have and there is a paragraph on page 7 that states:
"The vehicle code number B-12CS is a code set up to a positive identification of the vehicle. This particular code represents the following: B means Bombardier. 12 means 12 passengers, the capacity of the vehicle, C means it is powered by a Chrysler motor, S means the model is special."
Regards,
--Houlio--