Re: Pennsy K7, R7, X23/24 Underframe

Bill Welch

Thank you Bob, very interesting. The steel bracing used for the superstructure of the K7, R7, and X23/24 group of cars is a "Warren Truss" arrangement. I have read somewhere that this arrangement acted as a cantilever in terms of how it performed its tasks, and it interesting to see"cantilevers" mentioned in the description pf the U/F.

Bill Welch

--- In STMFC@..., "rwitt_2000" <rwitt_2000@...> wrote:

Bill Welch wrote:

Did the Pennsy have an official or de facto designation for the common
underframe they used with their K7, R7, and X23/24 group of cars?

The underframes are described to be of the same type as used on
passenger cars where the load of the superstructure and the lading are
transferred to the centersill through the crossbearers or cantilevers
and the end sills. Apparently from the description the body bolsters did
not transfer any of the load.
Bob Witt
Railway Gazette Mechanical Division vol. 88 no. 8 August 1914 p.419
[X25]Railway Age Gazette vol. 53 no. 14, October 4, 1912, p. 632 [X23,
R7, and K7]American Engineer, October 1912, p. 502Daily Raiway Age
Gazette June 13, 1914, p. 1412

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