Weaver has issued a series of Milwaukee Road ribbed boxcars which I have 13 of. If I put one of them next to a Lionel scale Milwaukee Road boxcar and an MTH premier Milwaukee Road boxcar I end up with 3 distinct sized boxcars. A 40' scale boxcar should be at least 10 1/4'' long to get an inside dimension 40' boxcar.
Paul
Nominal 40 foot box cars had an interior length of 40 feet 6 inches. With interior lining and end shapes the exterior length of the car body would be 41 feet+ or 10 1/4 inches for a 1:48 scale model. Add in end ladders, brake wheels and steps and the length grows slightly more.
Box car width has changed very little since the late 1930s. All your Weaver, Lionel PS-1 and MTH PS-1 or AAR cars should be very, very close in width. Car height among our models depends on two things. First, the prototypes varied. The 1937 AAR standard design called for a 10 foot interior height. Railroads soon started asking for cars that were a few inches taller and 10' 6" became common, especially after WW II. That makes for about 1/8" variation among O scale models. The second factor is ride height. The combination of deep flanges and tight curves in 3 rail O require many cars to sit higher on their trucks than the prototypes. All of our O scale model makers use their own trucks and there may be a significant variation in ride height. On recent MTH freight cars with provision for Kadee coupler mounting a shim of about 1/8" is included to move the Kadee coupler down if three rail trucks are retained. If two rail trucks are used the shims are not needed. Weaver trucks sit lower if the three rail coupler is removed and Kadee couplers are used but some underframe detail will need to be removed to use three rail wheel sets on the Milwaukee cars even on O-72 curves. (Trust me on that, I know!)
Unfortunately, some manufactures give the length with the couplers included. It would be nice if we could get some standards in the measurements from the manufactures also!
It seems reasonable that manufacturers would give the overall maximum dimension of their products. If they didn't I imagine someone would complain when ten boxcars advertised as 10 1/4" long didn't fit in his 104" long siding.
We have over 40 O scale box car models from Atlas, Lionel, MTH and Weaver and they are quite faithful to overall prototype dimensions. If you have any specific dimensional questions please post them. Item numbers and photos will help. It is likely that other people will be wondering about the same things that you are. If we can answer those questions here it should add to the reference value of this thread.
What a great thread. I have been severely chastised for asking about scales, but I am thick skinned, so I still ask.
Bob
I'm glad you like it. So far the boo birds have not gathered here. They have respected the discussion of scale cars by those interested in scale models. If you have specific questions ask away. If the car type you are interested in already has a thread on the 3RS forum and is linked above please post you question there. If you have a more general question or the car type does not have its own thread yet go ahead and ask here.
This is a great resource, and should be easily accessible, without having to go through the history.
Don
Some have suggested that this thread should be a sticky at the top of the 3RS forum. I think that would be a great idea. If one of our web masters would like to do that I am all for it.