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

On30 Model Railroad Building Built  Painted On30 Narrow Gauge Blacksmith Shop
On30 Model Railroad Building Built Painted On30 Narrow Gauge Blacksmith Shop
$94.00
Time Remaining: 12d 10h 26m
Buy It Now for only: $94.00
On30 Model Railroad Hotel Built Finished Lighted Narrow Gauge Model Railroad Bld
On30 Model Railroad Hotel Built Finished Lighted Narrow Gauge Model Railroad Bld
$120.00
Time Remaining: 12d 10h 27m
Buy It Now for only: $120.00
On30 Stone Model Railroad Building BUILT Millwork Included Narrow Gauge Railroa
On30 Stone Model Railroad Building BUILT Millwork Included Narrow Gauge Railroa
$60.00
Time Remaining: 12d 10h 28m
Buy It Now for only: $60.00
O Scale On30 Scale Model Railroad Depot Narrow Gauge Backwoods Passenger Freight
O Scale On30 Scale Model Railroad Depot Narrow Gauge Backwoods Passenger Freight
$128.00
Time Remaining: 12d 10h 47m
Buy It Now for only: $128.00

Other On30 Scale train items recently purchased through this site:

On30 Model Railroad Hotel Built Finished Lighted Narrow Gauge Model Railroad Bld
On30 Model Railroad Building Built Painted On30 Narrow Gauge Blacksmith Shop
O Scale On30 Scale Model Railroad Depot Narrow Gauge Backwoods Passenger Freight
On30 Stone Model Railroad Building BUILT Millwork Included Narrow Gauge Railroa