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

BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 603
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 603
$64.16
Time Remaining: 2h 1m
Buy It Now for only: $64.16
HO HOn3 WISEMAN MODEL SERVICES OT5143 KLEIBER OPEN CAB SEMI W TRAILER KIT
HO HOn3 WISEMAN MODEL SERVICES OT5143 KLEIBER OPEN CAB SEMI W TRAILER KIT
$36.95
Time Remaining: 2h 25m
Buy It Now for only: $36.95
HO HOn3 WISEMAN MODEL SERVICES OT5413 MACK AC LONG WHEELBASE LOG TRUCK
HO HOn3 WISEMAN MODEL SERVICES OT5413 MACK AC LONG WHEELBASE LOG TRUCK
$26.95
Time Remaining: 2h 26m
Buy It Now for only: $26.95
8 x Mushroom 85151 Flexrail Flexible Track 23 5 8 35 3 8in
8 x Mushroom 85151 Flexrail Flexible Track 23 5 8 35 3 8in
$43.88
Time Remaining: 2h 48m
Buy It Now for only: $43.88
Bachmann Spectrum On30 PRR Combine Car Brand New
Bachmann Spectrum On30 PRR Combine Car Brand New
$29.99
Time Remaining: 5h 6m
Hawthorne Village On30 Silver Moon Express Steam Locomotive Engine And Tender
Hawthorne Village On30 Silver Moon Express Steam Locomotive Engine And Tender
$69.95
Time Remaining: 5h 37m
Buy It Now for only: $69.95
O On3 On30 WISEMAN MODEL SERVICES DP89 2 SPOOL WINCH ON SKID KIT D
O On3 On30 WISEMAN MODEL SERVICES DP89 2 SPOOL WINCH ON SKID KIT D
$39.95
Time Remaining: 7h 26m
Buy It Now for only: $39.95
TG HO HOn3 BRASS MASTER CREATIONS 504 HO LOGGING WAGON ASSEMBLED B
TG HO HOn3 BRASS MASTER CREATIONS 504 HO LOGGING WAGON ASSEMBLED B
$39.95
Time Remaining: 8h 7m
Buy It Now for only: $39.95
HON3 CUSTOM WOODEN TURNOUT TIE JIG LEFT AND RIGHT 4 PER SHEET
HON3 CUSTOM WOODEN TURNOUT TIE JIG LEFT AND RIGHT 4 PER SHEET
$25.00
Time Remaining: 10h 6m
Buy It Now for only: $25.00
HARTFORD PRODUCTS FOUR 1203 SCALE ARCHBAR TRUCKS 26 DIA WHEELS
HARTFORD PRODUCTS FOUR 1203 SCALE ARCHBAR TRUCKS 26 DIA WHEELS
$178.00
Time Remaining: 11h 27m
Buy It Now for only: $178.00
Steam Logging Tractor Donkey O scale On30 custom weathered
Steam Logging Tractor Donkey O scale On30 custom weathered
$165.00
Time Remaining: 11h 28m
Buy It Now for only: $165.00
HO HOn3 WISEMAN MODEL SERVICES REA 15 HORSESHOE MEADOW DEPOT KIT FSM
HO HOn3 WISEMAN MODEL SERVICES REA 15 HORSESHOE MEADOW DEPOT KIT FSM
$69.95
Time Remaining: 12h 4m
Buy It Now for only: $69.95
HOn3 Silver Princess brass Gramps tank car in original box
HOn3 Silver Princess brass Gramps tank car in original box
$65.00
Time Remaining: 12h 45m
Buy It Now for only: $65.00
HOn3 Silver Princess brass DRGW caboose in original box
HOn3 Silver Princess brass DRGW caboose in original box
$85.00
Time Remaining: 12h 45m
Buy It Now for only: $85.00
ENHANCED BACHMANN On30 Painter of Light Observation Car
ENHANCED BACHMANN On30 Painter of Light Observation Car
$110.00
Time Remaining: 14h 7m
Buy It Now for only: $110.00
Peco ST 400 Setrack Starter Set OO 9 HOe
Peco ST 400 Setrack Starter Set OO 9 HOe
$99.87
Time Remaining: 18h 18m
Buy It Now for only: $99.87
Busch 33573 Tt Gauge Lime Bucket Wagon  Zeitz   New Original Packaging
Busch 33573 Tt Gauge Lime Bucket Wagon Zeitz New Original Packaging
$43.84
Time Remaining: 20h 30m
Buy It Now for only: $43.84
On30 5 Ton Wooden Hopper Car Prairie Locomotive Works NIB
On30 5 Ton Wooden Hopper Car Prairie Locomotive Works NIB
$39.99
Time Remaining: 23h 29m
Buy It Now for only: $39.99
Generals Flatbed Hawthorne Village Civil War Confederate Express MIB
Generals Flatbed Hawthorne Village Civil War Confederate Express MIB
$49.99
Time Remaining: 1d 1h 33m
Buy It Now for only: $49.99
Confederate Cannons Flat Car Hawthorne Village Civil War Confederate Express
Confederate Cannons Flat Car Hawthorne Village Civil War Confederate Express
$49.99
Time Remaining: 1d 1h 42m
Buy It Now for only: $49.99
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express MIB
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express MIB
$64.99
Time Remaining: 1d 2h
Buy It Now for only: $64.99

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Bachmann HOn30 Scale Narrow Gauge Train Box Van Red 77203 Thomas
NEVADA CENTRAL Sagebrush Narrow Gauge NEW BOOK
ON30 AMS 3000 Series Box Car Denver and Rio Grande Western DRGW 3146
ON30 AMS Flat Car Nevada County Narrow Guage NCNG 433
ON30 AMS 3000 Series Box Car Denver and Rio Grande Western DRGW 3262
NEW HO HON3 BRASS LEE TOWN CS COLORADO SOUTHERN SNOWPLOW BEAM PILOT 2043 CS
ON30 AMS Tank Car Standard Oil 106
HOn3 Silver Princess brass DRGW caboose in original box
ON30 AMS Flat Car Nevada County Narrow Guage NCNG 401
Bachmann On30 Scale Train Caboose Painted w round Roof Lighted interior
O SCALE On3 On30 WISEMAN MODEL SERVICES WESTMINSTER KEROSENE LOCOMOTIVE KIT
ON30 RAIL TRUCK CONVERSION KIT PASSENGER CAB FITS BACHMANN RAIL TRUCK
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
SCRATCH BUILT WOODEN ON30 GAUGE O SCALE COVERED BRIDGE NARROW GAUGE LAYOUT 58
Bachmann On30 Scale Train 18 Freight Cars High Gondola 2 box 26541
On18 Custom Built Diesel Loco