The Richart TTOS Mine loco was first issued in 1986. At that time, only 4 of the convention cars were made. Convention cars were made from 1983-1990, CMT producing the last years car. Hojack's list is quite accurate and for the record, the 1988 offering was touted as a Tool Car. These are seen in the middle 2 rows in the photo. Some cars had different graphics on either side.
Seen here in an TTOS ad in 1986, it is shown with a couple pre-production examples of future convention cars. The cars offered for sale with the loco were non-convention related cars, they just had the TTOS Mine Co lettering and/or the TTOS logo (top shelf in photo).
There were also convention related cars that are either painted, plated or lettered differently. These were either banquet cars, auction items or officer cars (bottom shelf).
The little loco is hefty, but has trouble pulling more than 4 cars and with the single roller pickup, it does not navigate switches/crossovers very effectively.
ARNO
