ARA steel Xm floor stringers


Earl Tuson
 

In various articles and publications, it's been established that the PRR issued a drawing in 1946 depicting a change that was to be instituted on X29 box cars whereby two floor stringers per side consisting of Z-bars were to be run from end to end on the underframe. Now, it's said that these were to replace the single-per-side wood stringers and pressed steel corner diagonals 'that the cars were built with'.

A review of published drawings in CBC's show that no floor stringers are represented in such steel box car plans, whether they are X29, ARA proposed standard plans, or even any of the related ARA single sheathed and double sheathed, box car, auto car, and even stock car designs. Most of the other plans, regardless of the car types, published in the same Cyc's show floor stringers! I do understand that CBC drawings were not construction drawings; they very typically omit vital details such as brake arrangements as well. (Corner diagonals ARE shown in all of these plans.)

However, there are very detailed ARA underframe component drawings on, for example, page 346 of the 1931 CBC. These also show NO accommodations for floor stringer attachment.

So, did none, some, or all ARA steel box cars ACTUALLY receive wood floor stringers when built from 1924 to 1934? Did the PRR (some time prior to 1946,) and perhaps others, retrofit wood stringers to cars that may have originally been built without them?

If you can, please provide references to primary sources (photos, general arrangements, etc,) that document a claim. I appreciate any assistance that can be provided.

Earl Tuson


Schleigh Mike
 

Hi Earl!

No stringers on the 1975 B&M XM-1 boxcars built by SSC 1929-1930.  SSC drawings (Pullman Library) and site photos of existing cars confirm absence.  Hope this helps if you are looking to account for all cars.

Mike Schleigh in 8 degree (F) Grove City, Penna.

On Wednesday, January 26, 2022, 06:28:00 PM EST, Earl Tuson <etuson@...> wrote:


In various articles and publications, it's been established that the PRR
issued a drawing in 1946 depicting a change that was to be instituted on
X29 box cars whereby two floor stringers per side consisting of Z-bars
were to be run from end to end on the underframe. Now, it's said that
these were to replace the single-per-side wood stringers and pressed
steel corner diagonals 'that the cars were built with'.

A review of published drawings in CBC's show that no floor stringers are
represented in such steel box car plans, whether they are X29, ARA
proposed standard plans, or even any of the related ARA single sheathed
and double sheathed, box car, auto car, and even stock car designs. Most
of the other plans, regardless of the car types, published in the same
Cyc's show floor stringers! I do understand that CBC drawings were not
construction drawings; they very typically omit vital details such as
brake arrangements as well. (Corner diagonals ARE shown in all of these
plans.)

However, there are very detailed ARA underframe component drawings on,
for example, page 346 of the 1931 CBC. These also show NO accommodations
for floor stringer attachment.

So, did none, some, or all ARA steel box cars ACTUALLY receive wood
floor stringers when built from 1924 to 1934? Did the PRR (some time
prior to 1946,) and perhaps others, retrofit wood stringers to cars that
may have originally been built without them?

If you can, please provide references to primary sources (photos,
general arrangements, etc,) that document a claim. I appreciate any
assistance that can be provided.

Earl Tuson