Mike Owen
You didn't mention the era that you are modeling. That and a home road or favorite road names would be helpful in narrowing down sugestions. There have been over 40 different boxcar models offered in O scale in the last 20 years. Atlas, Lionel and MTH continue to offer new product runs from time to time while their older car as well as those by Crown, Pecos River and Weaver are available as new old stock and used items.
Keep in mind that boxcars typically enjoy about a 40 year service life so wood side box cars from the 1920s could be found behind second generation diesels in the 1960s. Today the cars built for the 1970s box car boom are reaching the end of their lives, a situation posing a problem for remaining boxcar shippers like paper mills.
Here are a few general observations about the big three:
Atlas has offered more different boxcar models than any other manufacturer. As others have said, Atlas Masterline models are well detailed but may be fragile. Be sure to place them back in the box with the B end (hand brake) on the right and you will avoid most damage. Masterline models tend to be heavy, about 19-20 ounces for a 40 foot box car. Trainman models are less expensive and less detailed. They are also lighter, close to the NMRA recommended 15 ounces.
Since 2000 Lionel has produced some very good boxcar models. They have the best 40 foot PS-1 model out there. They also have some nicely done large boxcars based on 1960s and 70s prototypes. Weights are inconsistent. Models based on older tooling lack the detail of newer models and are equivalent to the Atlas Trainman line.
MTH is second only to Atlas in the number of differently tooled boxcar models available. Those produced from 1990s tooling are similar in detail level to the Atlas trainman line. The MTH boxcars tooled in the last 10-12 years have a very high level of detail and are more durable that some of the competitively detailed models. Weights are very consistent. An MTH 40 foot boxcar will weigh 17 ounces regardless of prototype.
Some favorites by era,
1918-1936:
Cars of this era tended to be smaller than those that followed and may fit in with both O scale and traditional sized trains. They are great for scale modeling in limited space.
Atlas, Lionel and MTH all make models of the USRA 40' double sheathed boxcar. MTH has good overall detail and the best rendering of the wood sides. Atlas offers as delivered Andrews trucks.
Atlas and MTH both offer very good models of the single sheathed USRA boxcar. Again, Atlas offers as delivered Andrews trucks.
Crown and Weaver offered boxcars that shared early 1930s style ends and roofs with single sheathed wood sides or steel sides and single or double doors.
Every railroad should have at least one PRR X-29 on the line. Atlas makes them.
Atlas Trainman 50' single sheathed wood side automobile boxcars are based on a late 1920s Pullman prototype. They model the monster size cars of the day and are good stand-ins for any single sheathed 50' automobile car of the late steam to diesel era.
1937-1942:
These boxcars used heights and widths previously found only on automobile boxcars. They are what many modelers now think of as standard size.
Atlas and MTH both offer models of the ubiquitous 1937 AAR 40' design. Atlas uses the old Intermountain tooling and has single and double door cars. MTH uses Viking roofs, appropriate for the Van Swerengen roads, not for others.
There were also several railroad designed 40 foot boxcars built in this era with distinctive appearances. Weaver made B&O wagon tops and Milwaukee Road rib side cars. Lionel makes the PRR X-31.
MTH and Pecos River have offered 50 foot steel side automobile box cars. MTH had fixed end doors. Pecos River offered plain ends or opening end doors. Both cars have 1990s level overall detail.
Pecos River also offered a 50' single door car, the only do do so.
1945-1960s
Boxcars of this era are of similar dimensions to those from 1937 but had new style ends and roof components and construction techniques.
Lionel, MTH and Weaver have all offered 40' boxcar models of the distinctive PS-1. Lionel sets the standard for PS-1 detail and comes with 6' or 8' doors.
Atlas offers a model of a 40' boxcar with commercially available roof and end components used by many car builders in the Trainman line.
Atlas and MTH offer very good models of the 50' PS-1 with a variety of door configurations.
The Lionel 50' double door boxcar is from this era. Some have opening end doors.
1960s-Today
Choices abound! Most cars built in this era are 50 or 60 footers. However, models are available from 40-80+ feet in length. Beware the bigger cars, they eat op a lot of real estate.
The Atlas Trainman 40' high-cube cars are a must if you have an appliance factory or warehouse on your layout.
The MTH 50' high-cube is a very detailed model of boxcars built in the 1990s by Gunderson.
Atlas and Lionel both make builder specific models of 60' boxcars.
Lionel is the king of monster boxcars with their 86' auto parts cars.
For info on other types of cars see the O Scale Freight Car Guide.
https://ogrforum.com/t...le-freight-car-guide