Re: Freight car Distribution

Brian Carlson

I told myself all day, I was wasn't going to get drawn into this subject.
However, I have to point out the ORER data tells us nothing about
distribution. It a big hardcopy database of useful information but not for
distribution. Armand has a lot of primary information, and Armand correct
me if I am wrong as I am going on memory from our conversations from awhile
back, on the Rutland. That information shed a lot of light on the various
movements on that road and the results didn't exactly mesh with the N-G.
Therefore in Armand's case, the N-G model shouldn't be applied to his

I would love more primary source material for my lines (Erie Meadville -
Salamanca, and PRR Erie - Renovo, but I have not unearthed wheel reports or
conductors books for 1957 so I am basing my boxcar population on the N-G
model. My conclusion with respect to the N-G model, which I mentioned in my
talk at Cocoa Beach a few years back, was that in the absence of specific
primary source data, the N-G model is a reasonable method to distribute the
boxcar population on a mainline trunk line railroad.

Brian J. Carlson, P.E.

Cheektowaga NY


From: STMFC@... [mailto:STMFC@...] On Behalf Of
Sent: Saturday, April 10, 2010 8:58 PM
To: STMFC@...
Subject: [STMFC] Re: Freight car Distribution

Tim, agreed, but it seems that Armand was lobbying for a "larger sample"
than perhaps had been done in the past.

Dan Sweeney, Jr.
Alexandria, VA

--- In STMFC@... <> , Tim O'Connor
<timboconnor@...> wrote:

Dan, please consult the STMFC archives. There are literally
HUNDREDS of posts on freight car distribution, many of them
meticulously researched by Tim Gilbert and many others. Also
Larry Ostresh has posted dozens of lists of fleet comparisons
for single and double sheathed box cars, which immediately
becomes an important issue if you want to represent not only
a railroad, but that PARTICULAR railroad's mix of box cars.

If you want to do a straight line percentage apportionment of
box cars, then an ORER is exactly the right (blunt) tool. But
then your layout may resemble an ORER and not a prototype.

Tim O'Connor

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