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'.

HO Gauge Bachmann White Pass  Yukon Set
HO Gauge Bachmann White Pass Yukon Set
$289.99
Time Remaining: 6h 57m
Buy It Now for only: $289.99
SPECTRUM NARROW GAUGE  RAIL BUS  FULL INTERIOR  UNDEC On30 Scale TrainNEW
SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW
$129.97
Time Remaining: 19h 30m
Buy It Now for only: $129.97
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
$37.95
Time Remaining: 1d 55m
Buy It Now for only: $37.95
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
$42.95
Time Remaining: 1d 55m
Buy It Now for only: $42.95
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
$42.95
Time Remaining: 1d 55m
Buy It Now for only: $42.95
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
$42.95
Time Remaining: 1d 55m
Buy It Now for only: $42.95
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
$37.95
Time Remaining: 1d 55m
Buy It Now for only: $37.95
SPECTRUM NARROW GAUGE  LITTLE RIVER LOGGING  RAIL BUS  On30 Scale TrainNEW
SPECTRUM NARROW GAUGE LITTLE RIVER LOGGING RAIL BUS On30 Scale TrainNEW
$129.97
Time Remaining: 2d 20h 47m
Buy It Now for only: $129.97
HOn3 Narrow Gauge Durango Press Rio Grande Southern Plow Flanger 02 kit
HOn3 Narrow Gauge Durango Press Rio Grande Southern Plow Flanger 02 kit
$49.99
Time Remaining: 3d 10h 28m
SPECTRUM NARROW GAUGE  GREEN BRIAR  BIG RUN  w SOUND  On30 Scale Train NEW
SPECTRUM NARROW GAUGE GREEN BRIAR BIG RUN w SOUND On30 Scale Train NEW
$239.97
Time Remaining: 3d 11h 30m
Buy It Now for only: $239.97
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
$350.00
Time Remaining: 3d 12h 59m
Buy It Now for only: $350.00
AY100 05 3x Utz Fama AlpinLine Gauge 0 m DC 5251 Gradient running track MINT
AY100 05 3x Utz Fama AlpinLine Gauge 0 m DC 5251 Gradient running track MINT
$29.73
Time Remaining: 3d 14h 30m
Buy It Now for only: $29.73
Roco 32401 Narrow Gauge H0E Electric Light Railway Soft Left
Roco 32401 Narrow Gauge H0E Electric Light Railway Soft Left
$36.81
Time Remaining: 4d 17h 35m
Buy It Now for only: $36.81
Backwoods Miniatures On30 Narrow Gauge Turntable Kit Model Railroad Equipment
Backwoods Miniatures On30 Narrow Gauge Turntable Kit Model Railroad Equipment
$49.95
Time Remaining: 5d 17h 39m
Noch 58671 HOM Hoe Rhne Viaduct for Narrow Gauge Railway  NIP
Noch 58671 HOM Hoe Rhne Viaduct for Narrow Gauge Railway NIP
$43.75
Time Remaining: 6d 7h 15m
Buy It Now for only: $43.75
Noch 58668 HOM Hoe bruchstein viadukt for Narrow Gauge Railway  NIP
Noch 58668 HOM Hoe bruchstein viadukt for Narrow Gauge Railway NIP
$58.34
Time Remaining: 6d 7h 15m
Buy It Now for only: $58.34
Grandt Line On3 Narrow Gauge Train Railroad Parts Assortment
Grandt Line On3 Narrow Gauge Train Railroad Parts Assortment
$99.99
Time Remaining: 6d 17h 16m
Buy It Now for only: $99.99
Simpson On3 Narrow Gauge Train Railroad Parts Assortment
Simpson On3 Narrow Gauge Train Railroad Parts Assortment
$89.99
Time Remaining: 6d 18h 9m
Buy It Now for only: $89.99
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 15 nd
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 15 nd
$73.03
Time Remaining: 7d 2m
Buy It Now for only: $73.03
Narrow Gauge Cumbres  Toltec 6 CD PHOTO SET 1300 JPEGS
Narrow Gauge Cumbres Toltec 6 CD PHOTO SET 1300 JPEGS
$29.99
Time Remaining: 7d 10h 38m
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: 7d 14h 26m
Buy It Now for only: $49.99

Other On30 Scale train items recently purchased through this site:

Backwoods Miniatures On30 Narrow Gauge Turntable Kit Model Railroad Equipment
SHINOHARA 6 LH CODE 70 NICKEL SILVER DUAL GAUGE TURNOUT NEW
Narrow Gauge Cumbres Toltec 6 CD PHOTO SET 1300 JPEGS
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
SPECTRUM NARROW GAUGE GREEN BRIAR BIG RUN w SOUND On30 Scale Train NEW
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
HO HOn3 SHINOHARA 6 DUAL GAUGE TURNOUT NARROW GAUGE SWITCH TRACK non weather
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
ACCUCRAFT AP28 301 TREADMILLER ROLLER 45mm Gauge 2 pkg NEW
RIO GRANDE Chasing the Narrow Gauge Volumes I II III By Robert W Richardson
NARROW GAUGE PICTORIAL ALL 11 VOLUMES
Simpson On3 Narrow Gauge Train Railroad Parts Assortment
SPECTRUM NARROW GAUGE LITTLE RIVER LOGGING RAIL BUS On30 Scale TrainNEW
SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW
Grandt Line On3 Narrow Gauge Train Railroad Parts Assortment
ULRICH O SCALE 1 48 On3 On30 FORD CAB CHASSIS NARROW GAUGE ALL METAL
ULRICH O SCALE 1 48 On3 On30 FORD TANDEM CAB CHASSIS NARROW GAUGE ALL METAL
Roco 32401 Narrow Gauge H0E Electric Light Railway Soft Left
ULRICH O SCALE 1 48 On3 On30 FORD CAB LOGGING TRAILER NARROW GAUGE ALL METAL
BINKLEY KIT BUILT HOn3 NARROW GAUGE COLORADO NORTHERN CN TRACK CLEANING WAGON nd
Noch 58671 HOM Hoe Rhne Viaduct for Narrow Gauge Railway NIP
HOn3 Narrow Gauge Durango Press Rio Grande Southern Plow Flanger 02 kit
AY69 05 10 x Utz Fama Roco AlpinLine Gauge 0 m DC 90 5118 5113 Track MINT