These covered hoppers were made by Roco in Austria for Atlas, and similar or identical versions have been made by at least Trix and Bachmann and marketed under various brand names. Atlas itself brought the body style over to its own United States manufactory, updated it and released it as part of the "second generation." Now made in China, Atlas still markets it in a fairly large number of roads and private owners. All this would result in some real confusion, except that the four paint schemes offered in the A1G quartet have never been duplicated on this particular car by anyone.

Variations on both the 2311 Jack Frost and 2312 Union Carbide/Bakelite Plastics have been uncovered, and thanks to Edward Bridges we have some closeups of the differences, see below for links.

The 2312 Union Carbide "Bakelite Plastics" car is a sentimental favorite, as there were once a number of them stationed in Perth Amboy, New Jersey on the end of the Lehigh Valley's branch from South Plainfield. I'd see them on our occasional trips to that city's business district-- which still has a sporting goods and photography store with a model train department, at which I purchased a fair number of these A1G cars during the 1970's and 1980's!

You probably won't break a sweat finding these cars around; the 2313 Milwaukee was found by this accumulator in a hobby shop in its original box more than 25 years after its initial release.

Key spotting features for this car are:
- underside of center sill of car stamped "Atlas Austria"
- ten round hatches on roof, in groups of four, two and four from end to end
- black roofwalk and brakewheel
- standard Atlas four wheel trucks with the usual "foldover" coupler fasteners
- stirrups at the four corners

Note: The following information on conditions and "Approximate Value" prices are intended to be a guideline only and is presented with no warranties, express or implied. Caution: Definitions and prices can and do vary with collectors, buyers and sellers, and, of course, whether a person is buying or selling an item. That's the way a "free market" works...

A 2310 series covered hopper in "as manufactured" or "AM" condition has:
- brake wheel intact and attached at the end of the car
- all stirrups intact
- no weathering
- no abrasions, scratches or other damage to the paint
- the original trucks with the original metal wheels which were fitted to the axles
- "Rapido" type couplers, truck mounted (this is a case where changing to Micro-Trains® trucks and/or couplers is not a plus!).
Note that minor paint flaws on these cars were common and should not be considered especially "collectible"; in fact, I'd rather have a "perfect" paint job.

A 2310 series car in "mint in box" or "MIB," meets all "As Manufactured" criteria plus:
- no dust, dirt or wear on the car itself
- no wear on wheels (although discolored wheels are common)
- kept in the original Atlas box
- box itself is intact with no cracks, breakage or crazing, with original Atlas label (usually white with black printing), plastic liner (usually blue), and cover. Both inserts and labels vary as the A1G series was sold for years. Store price stickers may or may not detract depending on the placement, size and wear.

There is no estimated value for "runner" cars in this series.

Table of Releases: Where available, click on "Image" to popup an image of the actual car.
Approximate Values Updated July, 2024.

Catalog #	Popup Image	Reporting Marks	Description	AV AM	AV MIB
2311a	Image	NSRX 305	Blue, White / Blue, White, Jack Frost, "Heavy Man"	5-7	7-9
2311b		NSRX 305	Blue, White / Blue, White, Jack Frost, "Thin Man"	5-7	7-9
2312a	Image	UCPX 3002	Red, White / Red, White, Union Carbide "Bakelite Plastics"	5-7	7-9
2312b		UCPX 30021	Red, White / Red, White, Union Carbide "Bakelite Plastics"	5-7	7-9
2313	Image	MILW 98657	Yellow/Black, Roadname Across	5-7	7-9
2314	Image	CB&Q 85117	Gray/Red, Black, R/N Acr, Burlington Hld R	5-7	7-9

The following images are through kind courtesy of Edward Bridges:
See a popup image comparison of the 2311 Jack Frost variations here (left side) and here (right side). The outline thickness of the "Jack Frost" figure (or "man") and dimensional data differ.
See popup image comparisons of the 2312 Bakelite variations here (left side) and here (right side). The road number and dimensional data differ.

AV = Approximate Value (US$ range)
AM = As Manufactured (see above)
MIB = Mint In Box (see above)
Abbreviations: Hld=Herald, R/N=Roadname, L/R=Left/Right Side of Car