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

On30 WISEMAN MODEL SERVICES SMALL LOGGING DISCONNECTS 6 PACK KIT
On30 WISEMAN MODEL SERVICES SMALL LOGGING DISCONNECTS 6 PACK KIT
$39.95
Time Remaining: 1d 16h 13m
Buy It Now for only: $39.95
On3 On30 WISEMAN MODEL SERVICES COLORADO  SOUTHERN PASSENGER COACH 70 KIT
On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT
$99.95
Time Remaining: 5d 2h 52m
Buy It Now for only: $99.95
On3 On30 WISEMAN MODEL SERVICES SM 105 DRGW RPO BAGGAGE PASSENGER CAR KIT
On3 On30 WISEMAN MODEL SERVICES SM 105 DRGW RPO BAGGAGE PASSENGER CAR KIT
$99.95
Time Remaining: 9d 17h 37m
Buy It Now for only: $99.95
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
$89.95
Time Remaining: 24d 1h 30m
Buy It Now for only: $89.95
On3 On30 WISEMAN SM 101 DRGW OPEN PLATFORM BAGGAGE PASSENGER CAR KIT
On3 On30 WISEMAN SM 101 DRGW OPEN PLATFORM BAGGAGE PASSENGER CAR KIT
$89.95
Time Remaining: 24d 1h 58m
Buy It Now for only: $89.95
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
$89.95
Time Remaining: 26d 18h 19m
Buy It Now for only: $89.95

Other On30 Scale train items recently purchased through this site:

On30 WISEMAN MODEL SERVICES SMALL LOGGING DISCONNECTS 6 PACK KIT
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
On3 On30 WISEMAN MODEL SERVICES SM 105 DRGW RPO BAGGAGE PASSENGER CAR KIT
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
On3 On30 WISEMAN SM 101 DRGW OPEN PLATFORM BAGGAGE PASSENGER CAR KIT
On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT