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'.

Wiseman Model V 16 148 O Scale AHD Small Donkey Engine Kit On3On30 2 Spool
Wiseman Model V 16 148 O Scale AHD Small Donkey Engine Kit On3On30 2 Spool
$54.95
Time Remaining: 1d 7h 46m
RS O On3 On30 CHOOCH ENTERPRISES 6110 SMALL TOWN WAREHOUSE W CAST IRON FRONT KIT
RS O On3 On30 CHOOCH ENTERPRISES 6110 SMALL TOWN WAREHOUSE W CAST IRON FRONT KIT
$69.95
Time Remaining: 1d 8h 30m
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 10h 34m
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 9h 12m
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 9h 41m
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: 27d 2h 1m
Buy It Now for only: $89.95

Other On30 Scale train items recently purchased through this site:

RS O On3 On30 CHOOCH ENTERPRISES 6110 SMALL TOWN WAREHOUSE W CAST IRON FRONT KIT
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT
Wiseman Model V 16 148 O Scale AHD Small Donkey Engine Kit On3On30 2 Spool
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
On3 On30 WISEMAN SM 101 DRGW OPEN PLATFORM BAGGAGE PASSENGER CAR KIT