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'.

Bachman 28498 ON30 Rail Bus  Trailer W Full Interior DCC
Bachman 28498 ON30 Rail Bus Trailer W Full Interior DCC
$97.50
Time Remaining: 3d 17h 29m
Buy It Now for only: $97.50
On30 scale Bachmann Spectrum Little River Logging Co Rail Bus  Trailer w DCC
On30 scale Bachmann Spectrum Little River Logging Co Rail Bus Trailer w DCC
$100.00
Time Remaining: 4d 8h 25m
Buy It Now for only: $100.00
Bachmann Spectrum On30 Rail Bus and Trailer Mint
Bachmann Spectrum On30 Rail Bus and Trailer Mint
$56.00 (6 Bids)
Time Remaining: 5d 21h 40m
SPECTRUM NARROW GAUGE  LITTLE RIVER LOGGING  RAIL BUS  On30 Scale TrainNEW
SPECTRUM NARROW GAUGE LITTLE RIVER LOGGING RAIL BUS On30 Scale TrainNEW
$129.97
Time Remaining: 6d 11h 50m
Buy It Now for only: $129.97
SPECTRUM NARROW GAUGE  GREEN BRIAR  BIG RUN  RAIL BUS  On30 Scale TrainNEW
SPECTRUM NARROW GAUGE GREEN BRIAR BIG RUN RAIL BUS On30 Scale TrainNEW
$129.97
Time Remaining: 6d 12h
Buy It Now for only: $129.97
SPECTRUM NARROW GAUGE  RAIL BUS  FULL INTERIOR  UNDEC On30 Scale TrainNEW
SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW
$129.97
Time Remaining: 9d 9h 37m
Buy It Now for only: $129.97

Other On30 Scale train items recently purchased through this site:

Bachmann Spectrum On30 Rail Bus and Trailer Mint
Bachman 28498 ON30 Rail Bus Trailer W Full Interior DCC
SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW
SPECTRUM NARROW GAUGE LITTLE RIVER LOGGING RAIL BUS On30 Scale TrainNEW
On30 scale Bachmann Spectrum Little River Logging Co Rail Bus Trailer w DCC
SPECTRUM NARROW GAUGE GREEN BRIAR BIG RUN RAIL BUS On30 Scale TrainNEW