By The Numbers
Walthers Freight Car Timeline
1400 Series Stoughton 45/102 Trailer
1450 series Stoughton 53' Van Trailers
1600 series 32' Van Trailer
1650 series 40' Trailer
1900 Series Stoughton 48' Semi Trailer
2000 series 40' Double Sheathed Wood Box Car with Dreadnaught Ends
2050 series X-29 Box Car
2100 Series 40' Single Sheathed Box Car w/Dreadnaught Steel Ends
2120 series 40' Wood Box Car w/Grain Doors
2150 series 40' Single Sheathed Box Car with Double Sheathed Ends
2200 series 40' Double Sheathed Wood Box Car with Wood Ends
2250 series 40' Double Sheathed Wood Box Car with ARA Steel Ends
2300 series 40' Wood Reefer
2400 series 1910-25 40' Wood Reefer w/Wood Ends
2500 series 40' All-Steel Reefer
2550 series General American Meat Reefers
2570 series 40' Steel Meat Reefers
2600 series 42' Flat Car
2900 series 42' Bulkhead Flat Car
2650 series 40' Single Sheathed Box Car with Braced Ends
2700 series 40' Double Sheathed Box Car -Early w/Braced Ends
2750 series Stock Car with Steel Ends
2800 series Stock Car with Wood Ends
2950 series 36' 50-ton Offset Side Hopper
3000 series 36' 50-ton Ribbed Side Hopper
3050 series 36' Wood Chip Hopper
3100 series 40' ARA Steel Box Car w/Wood Roofwalk
3200 series 40' Plug Door Box Car
3250 series 65' Mill Gondola
3300 series 40' Plug Door Reefer
3350 series Stock Car with Slatted Open Ends
3450 series 50' North American RBL Smoothside Box Car
3500 series 40' AAR Steel Box Car
3600 series 50' North American Plug Door EP Box Car
3650 series 50' Airslide Covered Hopper
3700 series 40' PS-1 Box Car
3750 series GSC Commonwealth 53'-6" Flat Car
3800 series 40' Gondola
3851 series 50' Cushion Coil Cars
3899 series 55' Cushion Coil Cars w/Round Hoods
3930 series 5-Unit All-Purpose Spine Car
3950 series 75' Piggyback Flat Car
3980 series Front Runner
4000 series 45' Logging Flat Car w/Logs
4100 series 72' Centerbeam Flat Car
4200 series Ballast Hopper
4350 series Bay Window Caboose
4600 series 39' Single-Bay Airslide Covered Hopper
4653 series Dynamometer Car
4680 series 84' Paired Airslide Hoppers
4700 series Waffle Side Box Car
4750 series RBL Insulated 50' Box Car
4800 series 89' Enclosed Auto Carrier
4850 series 89-foot Tri-Level Enclosed Auto Carrier
4900 series 100-Ton Quad Hopper
4950 series 89' Channel-Side Flat Car
5000 series 10,000 Gallon Steam/Diesel Tank Car
5100 series 30' Funnel-Flow Tank Car
5150 series 40' Funnel-Flow Tank Car
5200 series 54' Funnel-Flow Tank Car
5250 series 65' Propane Tank Car
5257 series 65' Anhydrous Ammonia Tank Car
5300 series Bethgon Coalporter Gondola
5350 series Jordan Spreader
5400 series 37' Cement Covered Hopper
5450 series Cryogenic Refrigerated Box Car
5630 series 81' Depressed Center Four-Truck Flat Car
5650 series Scale Test Car
5700 series PS-2 Center Discharge Hopper
5849 series PD Covered Hopper
5850 series 50' Single-Sheathed Double-Door Box Car
5900 series Thrall 53-foot Gondola
6040 series Gunderson 60-foot Box Car
7000 series Thrall All-Door Box Car
7050 series 40' Ortner 100-Ton Open Aggregate Hopper
7100 series Gunderson 50' High-Cube Paper Service Box Car
7150 series 64' Plastic Pellet Hopper
7270 series 23,000 Gallon Tank Car
7450 series 46' USRA Steel Gondola
7660 Series Milwaukee Rib-Side Caboose
7880 series Depressed Center Flat Car
7930 series Fruit Growers Express 50' Mechanical Reefer
9146 series 40' Scrap Gondola
Tim McCoy Wild West Show
The Great Circus Train
53' Single-Unit Well Car
50' Pulpwood Car
Trinity RD4 Coal Hoppers
Greenville Wood Chip Hoppers
Difco Car
Five-Unit Articulated Well Flats
40' Reefer Six-Packs
55' Cushion Coil Car
86' Four-Door Hi-Cube Box Car
60' Double-Door Auto Parts Box Car
P-S 60' Single-Door Auto Parts Box Car
7600 Series SP C-30-1 Wood Caboose
100000 Series Trinity 14K Molten Sulfur Tank Car
910-4900 Series Well Car
5750 Series Russell Snow Plow
Site Notes

50' Airslide Covered Hopper
ADM Milling (gray)
No.932-3659 Kit -1988 Release

50' Airslide Covered Hopper Kit
ATSF (brown)
No.932-3660 -1988 Release

50' Airslide Covered Hopper
Burlington Northern
No.932-3665 Kit -1988 Release
No.932-3682 Single Car RTR -2002 Release
No.932-23682 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper
Burlington Northern Santa Fe
No.932-3686 Single Car RTR -2002 Release
No.932-23686 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper Kit
Chessie System -C&O (yellow)
No.932-3652 -1988 Release

50' Airslide Covered Hopper Kit
Chicago & North Western
No.932-3668 -1989 Release
No.932-9098 3-Pack -1993 Release
The Walthers 3-Pack of CNW 50' Airslides (#932-9098) included one painted gray with black lettering; one painted yellow with black lettering; and green with yellow lettering.  The set of kits retailed for $29.98.

50' Airslide Covered Hopper
No.932-3671 Kit
No.932-3685 Single Car RTR -2002 Release
No.932-23685 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper Kit
DRGW (gray)
No.932-3656 -1988 Release

50' Airslide Covered Hopper Kit
DRGW (orange)

50' Airslide Covered Hopper
No.932-3657 Kit -1988 Release
No.932-3684 Single Car RTR -2002 Release
No.932-23684 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper Kit
Grand Trunk Western
No.932-3666 Kit -1988 Release

50' Airslide Covered Hopper
Milwaukee Road (yellow)
No.932-3653 Kit -1988 Release

50' Airslide Covered Hopper Kit

50' Airslide Covered Hopper Kit
N&W (gray)

50' Airslide Covered Hopper Kit
Southern (gray)
No.932-3651 -1988 Release

50' Airslide Covered Hopper Kit
Southern Pacific
No.932-3661 -1988 Release

50' Airslide Covered Hopper 3-Pack Kit

50' Airslide Covered Hopper
Union Pacific
No.932-3655 Kit -1988 Release
No.932-3681 Single Car RTR -2002 Release
No.932-23681 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper
Wonder Bread
No.932-3667 Kit -1988 Release
No.932-3683 Single Car RTR -2002 Release
No.932-23683 Two-Pack RTR -2002 Release

50' Airslide Covered Hopper Kit
No.932-3665 -1988 Release

Corn Products Cars Kits
Corn Products
No.932-9100 -1993 Release
This '93 release included a 39' Airslide Hopper; 50' Airslide Hopper; and a 40' Funnel-Flow Tank Car.  The set retailed $29.98.

This site places the orgin of the modern Walthers HO-scale freight car with the 50' Airslide Covered Hopper in 1987. 
Walthers had throughout its history provided HO-scale freight car kits.  Prior to the mid-'80s, the majority of Walthers freight cars would be considered rather crude by today's standards.  Kits sold before the introduction and inclusion of the former Train Miniature offerings into the Walthers line in the 1980s often had raw wood and metal materials and required a fair amount of craftsmanship.
Walthers moved into the market established by companies like Athearn and Roundhouse with the new kits added to the line in the '80s.  As stated, the mid-'80s saw the defunct Train Miniature kits brought in the Walthers line.  The first truly new tooling, never-before-available kit was the 50' Airslide Covered Hopper introduced in the 1987 catalog. 
It should be noted, Train Miniature announced a 50' Airslide Covered Hopper in 1982.  The Train Miniature Airslide was never delivered.  Train Miniature ceases to exist not long after this announcement for the 50' Airslide Hopper.  Walthers starts their modern kit line with the former Train Miniature catalog.  This is only speculation, but in the purchase of Train Miniature assets, Walthers may have taken delivery of an in-development 50' Airslide Hopper that later became this model.
The first group of 50' Airslides included six roadnames:  Milwaukee Road, GATX, ADM, BN, UP, and Grand Trunk Western.  No Undecorated Airslide is found in the '87 catalog listing.  The kit originally sold for $5.95 and included sprung roller bearing trucks.

Walthers lists eight roadnames (ADM, BN, Wonder Bread, CNW, Golden West, NS, GATX, and CSXT) in 1998 with a note that the cars then had new roadnumbers.  The stock number remained the same as it was in previous releases.
Walthers introduces ready to run 50' Airslide Covered Hopper models in the 2002 HO Reference Book.  The first ready to run release included six roadnames (UP, BN, Wonder Bread, GATX, CSXT, and BNSF) selling for $12.98 in singles and $25.98 in limited-run two-packs.  No Undecorated ready to run is found in 2002 release.

Please note that this site was created for use by those with an interest in HO-scale model trains. The author is not affiliated with, nor representing Walthers in any way. Images presented are obtained from a variety of sources. Many are Walthers images used to promote its products and thus are owned and copyright by Walthers. I do not have items available for sale, nor do I have information regarding repair or replacement parts, etc. This site is intended for your enjoyment and information only. Thank You.