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

4 Spectrum ON30 PRR 26414 Baggage+27014 BOXCAR+27514 STOCK+27214 GON OBs VG+Deal
4 Spectrum ON30 PRR 26414 Baggage+27014 BOXCAR+27514 STOCK+27214 GON OBs VG+Deal
$115.00
Time Remaining: 8h 33m
On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
$37.00
Time Remaining: 2d 23h 37m
Buy It Now for only: $37.00
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
$91.82
Time Remaining: 4d 2h 40m
Buy It Now for only: $91.82
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
$91.82
Time Remaining: 4d 2h 40m
Buy It Now for only: $91.82
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
$45.91
Time Remaining: 4d 2h 42m
Buy It Now for only: $45.91
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
$45.91
Time Remaining: 4d 2h 42m
Buy It Now for only: $45.91
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
$45.91
Time Remaining: 4d 2h 42m
Buy It Now for only: $45.91
Bachmann On30 Scale Train Box Car White Pass  Yukon 27001
Bachmann On30 Scale Train Box Car White Pass Yukon 27001
$45.91
Time Remaining: 4d 2h 42m
Buy It Now for only: $45.91
Bachmann HOn30 Scale Narrow GaugeTrain Box Van Blue 77202 Thomas
Bachmann HOn30 Scale Narrow GaugeTrain Box Van Blue 77202 Thomas
$48.17
Time Remaining: 4d 2h 45m
Buy It Now for only: $48.17
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
$66.52
Time Remaining: 7d 18h 7m
Buy It Now for only: $66.52
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
$59.99
Time Remaining: 14d 5h 36m
Buy It Now for only: $59.99
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
$66.52
Time Remaining: 15d 14h 21m
Buy It Now for only: $66.52
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
$66.52
Time Remaining: 18d 17h
Buy It Now for only: $66.52
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
$36.00
Time Remaining: 21d 20h 31m
Buy It Now for only: $36.00
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
$66.52
Time Remaining: 27d 13h 34m
Buy It Now for only: $66.52
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express NEW
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express NEW
$49.99
Time Remaining: 28d 3h 59m
Buy It Now for only: $49.99
Stonewall Jackson Box Car Hawthorne Village Civil War Confederate Express NEW
Stonewall Jackson Box Car Hawthorne Village Civil War Confederate Express NEW
$49.99
Time Remaining: 28d 4h
Buy It Now for only: $49.99
JEB Stuart Boxcar Hawthorne Village Civil War Confederate Express MIB
JEB Stuart Boxcar Hawthorne Village Civil War Confederate Express MIB
$32.99
Time Remaining: 29d 4h 33m
Buy It Now for only: $32.99
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
$66.52
Time Remaining: 29d 22h 6m
Buy It Now for only: $66.52
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: 30d 22h 5m
Buy It Now for only: $64.99

Other On30 Scale train items recently purchased through this site:

On30 Fat Albert Boxcar Conversion to fit Bachmann 18ft flat car
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
Bachmann On30 Scale Train 18 Box Car W Murphy Roof Gray 2 box 26553
Bachmann On30 Scale Train Box Car South Pacific Coast Sunset Logo 27002
JEB Stuart Boxcar Hawthorne Village Civil War Confederate Express MIB
Stonewall Jackson Box Car Hawthorne Village Civil War Confederate Express NEW
Bachmann On30 Scale Train 18 Freight Cars Box Car 2 per box 26501
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express NEW
4 Spectrum ON30 PRR 26414 Baggage+27014 BOXCAR+27514 STOCK+27214 GON OBs VG+Deal
Bachmann On30 Scale Train Box Car Mineral Red Data Only 27098
Bachmann On30 Scale Train Box Car Oxide Red Data Only 27097
Bachmann On30 Scale Train Box Car White Pass Yukon 27001
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 3145 n
BINKLEY KIT BUILT HOn3 NARROW GAUGE DENVER RIO GRANDE DRGW BOX CAR WAGON 315 nd
HAWTHORNE VILLAGE On30 BACHMANN CONFEDERATE CIVIL WAR J E B STUART BOX CAR 005
A Plan For VIctory Box Car Hawthorne Village Civil War Confederate Express MIB
Bachmann HOn30 Scale Narrow GaugeTrain Box Van Blue 77202 Thomas
BINKLEY KIT BUILT HOn3 NARROW GAUGE DSPPRR DENVER SOUTH PARK REEFER BOX CAR 606
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 605