From Walthers it's an HO "Mainline" 39' Trinity 3281 cubic foot 2-bay covered hopper in the VTG North America (VTGX) gray scheme with black lettering and logo.
The car numbers include:
Part #910-7561, Car #350118
Part #910-7562, Car #350188
Part #910-7563, Car #350198
Part #910-7564, Car #350008