We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for '4-6-0'.

On30 4 6 0 STEAM SV O B ETWNC 12  BAC28904 ORGINAL BOX Retail53900
On30 4 6 0 STEAM SV O B ETWNC 12 BAC28904 ORGINAL BOX Retail53900
$512.05
Time Remaining: 10d 16h 25m
Buy It Now for only: $512.05
On30 4 6 0 STEAM SV O B GBR  BAC28906 ORGINAL BOX Retail 53900
On30 4 6 0 STEAM SV O B GBR BAC28906 ORGINAL BOX Retail 53900
$512.05
Time Remaining: 10d 16h 25m
Buy It Now for only: $512.05

Other On30 Scale train items recently purchased through this site:

On30 4 6 0 STEAM SV O B ETWNC 12 BAC28904 ORGINAL BOX Retail53900
On30 4 6 0 STEAM SV O B GBR BAC28906 ORGINAL BOX Retail 53900