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

Noch 58671 HOM Hoe Rhne Viaduct for Narrow Gauge Railway  NIP
Noch 58671 HOM Hoe Rhne Viaduct for Narrow Gauge Railway NIP
$40.08
Time Remaining: 1d 11h 49m
Buy It Now for only: $40.08
Noch 58668 HOM Hoe bruchstein viadukt for Narrow Gauge Railway  NIP
Noch 58668 HOM Hoe bruchstein viadukt for Narrow Gauge Railway NIP
$53.43
Time Remaining: 1d 11h 49m
Buy It Now for only: $53.43
Simpson On3 Narrow Gauge Train Railroad Parts Assortment
Simpson On3 Narrow Gauge Train Railroad Parts Assortment
$89.99
Time Remaining: 2d 6h 37m
Buy It Now for only: $89.99
Narrow Gauge Cumbres  Toltec 6 CD PHOTO SET 1300 JPEGS
Narrow Gauge Cumbres Toltec 6 CD PHOTO SET 1300 JPEGS
$29.99
Time Remaining: 2d 15h 12m
Buy It Now for only: $29.99
ULRICH O SCALE 1 48 On3 On30 FORD CAB  CHASSIS NARROW GAUGE ALL METAL
ULRICH O SCALE 1 48 On3 On30 FORD CAB CHASSIS NARROW GAUGE ALL METAL
$49.99
Time Remaining: 2d 19h
Buy It Now for only: $49.99
ULRICH O SCALE 1 48 On3 On30 FORD CAB  LOGGING TRAILER NARROW GAUGE ALL METAL
ULRICH O SCALE 1 48 On3 On30 FORD CAB LOGGING TRAILER NARROW GAUGE ALL METAL
$69.99
Time Remaining: 2d 20h 25m
Buy It Now for only: $69.99
ULRICH O SCALE 1 48 On3 On30 FORD TANDEM CAB  CHASSIS NARROW GAUGE ALL METAL
ULRICH O SCALE 1 48 On3 On30 FORD TANDEM CAB CHASSIS NARROW GAUGE ALL METAL
$52.99
Time Remaining: 3d 17h 19m
Buy It Now for only: $52.99
BINKLEY KIT BUILT HOn3 NARROW GAUGE COLORADO NORTHERN CN ORE WAGON
BINKLEY KIT BUILT HOn3 NARROW GAUGE COLORADO NORTHERN CN ORE WAGON
$132.21
Time Remaining: 3d 23h 55m
Buy It Now for only: $132.21
Sunset Valley RR TR NG SS Narrow Gauge 45mm Stainless Track
Sunset Valley RR TR NG SS Narrow Gauge 45mm Stainless Track
$53.54
Time Remaining: 4d 14h 9m
Buy It Now for only: $53.54
Sunset Valley RR TR NG NS Narrow Gauge 45mm Nickel Silver Track
Sunset Valley RR TR NG NS Narrow Gauge 45mm Nickel Silver Track
$62.99
Time Remaining: 4d 14h 12m
Buy It Now for only: $62.99
Sunset Valley RR SW 4 BR WYE Narrow Gauge 4 40 45mm Brass WYE Switch
Sunset Valley RR SW 4 BR WYE Narrow Gauge 4 40 45mm Brass WYE Switch
$120.74
Time Remaining: 4d 14h 34m
Buy It Now for only: $120.74
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
$260.00
Time Remaining: 4d 20h 21m
Buy It Now for only: $260.00
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
$65.77
Time Remaining: 5d 8h 59m
Buy It Now for only: $65.77
12 Peco Code 100 36 inch Flex Streamline SL 500 Narrow Gauge Track
12 Peco Code 100 36 inch Flex Streamline SL 500 Narrow Gauge Track
$35.00
Time Remaining: 5d 18h 57m
Busch 31174 Tt Gauge Flat Wagon Samm 4818 New Original Packaging
Busch 31174 Tt Gauge Flat Wagon Samm 4818 New Original Packaging
$48.94
Time Remaining: 6d 16h 3m
Buy It Now for only: $48.94
Roco 32401 Narrow Gauge H0e Electric Light Railway Soft Left
Roco 32401 Narrow Gauge H0e Electric Light Railway Soft Left
$33.60
Time Remaining: 7d 18h 51m
Buy It Now for only: $33.60
AY69 05 10 x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5118 5113 Track MINT
AY69 05 10 x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5118 5113 Track MINT
$30.35
Time Remaining: 9d 1h 41m
Buy It Now for only: $30.35
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 605
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 605
$65.77
Time Remaining: 9d 7h 52m
Buy It Now for only: $65.77
g Peco Streamline O 165 Oe Narrow Gauge Medium Radius Left Right Turnout
g Peco Streamline O 165 Oe Narrow Gauge Medium Radius Left Right Turnout
$40.00
Time Remaining: 9d 19h 51m
Buy It Now for only: $40.00
AY72 05 8x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5117 Compensation pieceW
AY72 05 8x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5117 Compensation pieceW
$25.29
Time Remaining: 9d 20h 4m
Buy It Now for only: $25.29
AY73 05 10 x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5116 5111 Track NIP
AY73 05 10 x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5116 5111 Track NIP
$30.35
Time Remaining: 9d 20h 27m
Buy It Now for only: $30.35

Other On30 Scale train items recently purchased through this site:

NEVADA CENTRAL Sagebrush Narrow Gauge NEW BOOK
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
Sunset Valley RR TR NG SS Narrow Gauge 45mm Stainless Track
Sunset Valley RR TR NG NS Narrow Gauge 45mm Nickel Silver Track
Narrow Gauge Cumbres Toltec 6 CD PHOTO SET 1300 JPEGS
g Peco Streamline HO OO Gauge Narrow Gauge LH RH Turnout BOXED
On30 Narrow Gauge Locomotive Shed WITH SHOP Built Shay Climax Heisler Locos
On30 Narrow Gauge Train Set Loco Tender 3 Cars Scratch Built Weathered Train
THREE VOLUME SET RIO GRANDE Chasing the Narrow Gauge Vol I II III
Sunset Valley RR SW 4 BR WYE Narrow Gauge 4 40 45mm Brass WYE Switch
On30 Narrow Gauge Fire Station Late 1800s Early 1900s Fire Station O Scale
BUILT On30 Blacksmith Shop Narrow Gauge Backwoods Shop With Window On Rear Wall
BUILT On30 Narrow Gauge Stone Backwoods Miners Cabin Loggers Cabin
On30 Model Railroad Hotel Built Finished Lighted Narrow Gauge Model Railroad Bld
On30 Model Railroad Building Built Painted On30 Narrow Gauge Blacksmith Shop
O On30 Narrow Gauge Passenger Depot Ellicott City Style BUILT Millwork Included
BUILT On30 Blacksmith Shop Narrow Gauge Backwoods Shop With Chimney On Rear Wall
g Peco Streamline O 165 Oe Narrow Gauge Medium Radius Left Right Turnout
Varian 0572 K7360 301 Ionization Gauge
O Scale On30 Scale Model Railroad Depot Narrow Gauge Backwoods Passenger Freight
BUILT On30 Narrow Gauge Stone Railroad Passenger Depot On30 Custom Weathered
On30 Built Narrow Gauge LeanToo Stone Shed Open Front W McCormick Deering Tracto
On30 Hotel Complete Built Narrow Gauge RR Two Story City Stone Building O Scale
SPECTRUM NARROW GAUGE GREEN BRIAR BIG RUN w SOUND On30 Scale Train NEW
On30 Stone Model Railroad Building BUILT Millwork Included Narrow Gauge Railroa