Chuck's explanation was better -- I'd forgotten about the draft(longitudinal) forces on the center sill. Please don't use the underframe of the Athearn gon as an example ofanything that resembles an

Schuyler Larrabee replies: "Well, no. First of all, the floor only has to be strong enough to bear the weight of the load as far as the next available structural member, likely a stringer leading to

Thanks for the correction, Ed !

http://lists.railfan.net/erielackphoto.cgi?erielack-09-27-15/C1669.jpg More from the Steamtown archives, probably in Scranton (not verified) but posted here for the few freight cars, the electric

Tim wrote: Sure the floor has to be strong enough to take a certain direct downward load per square foot -- but the load as a whole must be carried by the sides, no, just as it is for a bridge?

Bob, If you get near Danville, Virginia,there is a scrap yard next to US 58 by the river that has a green (really faded)wagon top. My guess is that it had been in express service. It is being

Kevin, Which one, they evolved like all freight cars. There are drawings in theCyc's but which car are you looking for. Greg Martin Eventually all things merge into one and a river runs

As I said before, These cars are covered in RPC 13, including several drawings. That volume is still available here: http://rpcycpub.com/ Scott Haycock On Sep 26, 2015, at 5:40 PM, Kevin

Tim, Those numbers are for the M-15 wagon-top rebuilds. I have been more specific in my replies and was limiting them to the wagon-top classes M-53 and M-53a built new. If one includes the twice

Kevin, If you're looking for railroad drawings of the car, try the Milwaukee Public Library. This institution received a lot of material from the railroad. Regards, Ed Hawkins

B&O 375160 and 377002 were rebuilt from earlier M-15 class wagon top cars in 1955, according to B&O diagrams for these cars. The 375160 (former class M-15-k) was class M-15p with 6' wide doors. The

The depth of the member doesn't necessary mean more strength in bending. In other words you can have two girders with different depths, but the same strength. Different strength (thickness or

I know of a photo of a class C-16 B&O express car (made from M-53 wagon top boxcars) which has an expanded metal running board and end platforms. It no doubt kept them when returned to freight service

Tim, that bridge does not have to endure buff and draft forces. In other words, it will not have to pull a hundred other bridges nor have slack run in between the Big Horn Mountains and the Grand

Bob I have two photos, both after the period of this list. Car numbers 375160 and 377002. Both with APEX open grid running boards.

I appreciate all the insightful verbiage ... :-) but what got the cogs& wheels moving in my brain was the idea that a through-girder bridge has no"underframe" per se -- just a floor with cross-braces

The earliest example that I can find with Youngstown doors is a photo of B&O 381875, M-53, shopped at DuBois [DU] on 11-50 with the Barkan designated "Post War 13 Great States" lettering used from

Schuyler says: "Hey, Sheriff, how's it goin???" Well, not too bad although I have to say that the discussion about beams, bridges and frt car strength reminds me of the time too many yrs ago when in

Well, Tim, if you want to get into advance structural engineering, there are situations where depth of structure needs to be minimized. The first answer is that if you only had the top flange of a

---In STMFC@..., <timboconnor@...> wrote : exactly .. so why use the web if it only adds weight and cost, and nostrength ? ================= Tim, If talking about boxcars, to keep the load from