The RICHARDSON TRGX 3-bay covered hopper was built by National Steel Car. It has not been made in any scale yet. Somebody like Atlas, Bachmann, or MTH would need to make the NSC 3-bay covered hoppers in N, HO, S, & O all at the same time so we could get these covered hoppers in O scale.
Andrew
But what color schemes do you have for this model besides boring battleship grey?