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ACR Side Construction
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Group,
A very good look at the inside of an ACR boxcar side and how it's constructed. https://donstrack.smugmug.com/UtahRails/Union-Pacific/UP-Freight-Cars/i-bgD2NbD/A Dan Smith |
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Ed Hawkins
Bill, Dan Smith says to follow this!!! Ed |
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Ed Hawkins
STMFC,
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My apologies for replying to the STMFC instead of forwarding the message to my friend Bill, who I know has been working on a model of this general type. Regards, Ed Hawkins
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Tony Thompson
Note that it’s an ACR side, with the light angles between the main posts. The assembled car at left is too. |
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Schuyler Larrabee
OK, I see that an ACR side has a secondary smaller mid-panel rib, secured with rivets spaced at double the spacing for the main ribs/panel joints.
So once again, what is the term for the rivet pattern that reveals the use of a hat channel at the panel joints, where there also is a principal line of closely spaced rivets along with a secondary line which is double spaced?
BTW, in this second instance, the double-spaced line is sometimes in the same grid as the closely spaced line, and is sometimes offset by a half step, so to speak.
Schuyler
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Tony Thompson
Sent: Friday, June 04, 2021 5:48 PM To: main@RealSTMFC.groups.io Subject: Re: [RealSTMFC] ACR Side Construction
Note that it’s an ACR side, with the light angles between the main posts. The assembled car at left is too.
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Very interesting photo. The photo doesn't give a location. But I would guess it is not Omaha in the winter.
I like the long shop truck in the foreground and the stacked air brake reservoirs and other parts. Under the shop track there appear what may be wood kegs of rivets? If you go to the previous photo it looks like they are lowering the frame onto the trucks. is that a drawbar casting in the lower right? The following photo is also an interesting view of a GS type flat car under construction. -- Ken Adams Still in splendid Shelter In Place solitude, about half way up Walnut Creek Owner PlasticFreightCarBuilders@groups.io |
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Randy Hammill
I don’t know the answer to that, but a I do wonder where the term ACR came from. Was it an industry term or something coined by modelers/historians?
I suppose I should go digging through CBCs when I get home. Randy -- — Randy Hammill Prototype Junction http://prototypejunction.com Modeling the New Haven Railroad 1946-1954 http://newbritainstation.com |
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Randy
ACR was a solution that arose when railroads chose to use thinner copper bearing steel side sheets (Cor-Ten steel) that were not as rigid as the thicker conventional side sheets. The UP obviously felt the weight savings was worth the extra cost, while some like the SP only used it for some cars and then dropped it. (The Cor-Ten side sheets required an extra vertical stiffener.) As for the terminology, I don't know who coined it. :-) Tim O'Connor On 6/5/2021 11:01 AM, Randy Hammill wrote: I don’t know the answer to that, but a I do wonder where the term ACR came from. Was it an industry term or something coined by modelers/historians? --
Tim O'Connor Sterling, Massachusetts |
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Dennis Storzek <destorzek@...>
On Sat, Jun 5, 2021 at 08:01 AM, Randy Hammill wrote:
Was it an industry term or something coined by modelers/historians?Has to be a modeler's term. On the prototype they'd be concerned with the structural member, not the attachment rivets. Dennis Storzek |
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Terry Metcalfe's UP Freight Cars book (p 93) mentions that the B-50-24 construction saved over 5,000 pounds over the B-50-19 and that the October 1939 issue of Railway Mechanical Engineer has an extensive article on the cars. If someone has that issue of RME maybe we can find out whether they had a name for this style of construction. :-) Tim O'Connor On 6/5/2021 2:37 PM, Dennis Storzek wrote: On Sat, Jun 5, 2021 at 08:01 AM, Randy Hammill wrote: --
Tim O'Connor Sterling, Massachusetts |
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Randy Hammill
Yes, I know why they have the extra rivets, just didn't know if there was an industry term.
The 1943 CBC has a notation of a photo of 187085, noted as, "light weight construction." It also has another notation: Description, Railway Mechanical Engineer, October, 1939--Description of earlier lot, Class B50-21, Railway Mechanical Engineer, April 1938. I hadn't noticed such information before. For a D&RGW auto car it notes that it was described in Railway Age, January 13, 1940 and Railway Mechanical Engineer in February, 1940. It also has two pictures that are reversed - 186028 has a caption that says it is of low-alloy high-tensile steel but is a picture of 186028, a welded car, and there's a picture of 193464 with a caption that says, "Welded construction," although it's clearly not as it's a car with ACR. Oops. My suspicion is, "light weight construction," and, "low-allow high-tensile steel," will be reflected in those articles since the lighter weight was the selling point, not the fact that there were additional intermediate stiffeners required. Time to read RP Cyc 31-32 again a little more closely... Randy -- — Randy Hammill Prototype Junction http://prototypejunction.com Modeling the New Haven Railroad 1946-1954 http://newbritainstation.com |
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Bill Kelly
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Find the January 1987, vol 3 number 1 issue of the UPHS magazine,
_The Streamliner_. There is a very good article by Frank Peacock titled "Box and
Autocar Nomenclature". This is the first publication of his term "ACR" along
with many others.
Later,
Bill Kelly
Tim wrote:
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