We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for 'Rail Bus'.

Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL
Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL
$299.99
Time Remaining: 53m
bachmann on30 Rail Bus  Trailer DCC
bachmann on30 Rail Bus Trailer DCC
$150.00
Time Remaining: 29d 7h 57m
Buy It Now for only: $150.00

Other On30 Scale train items recently purchased through this site:

bachmann on30 Rail Bus Trailer DCC
Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL