On Wed, 2006-02-22 at 09:06 -0800, Ed Hawkins wrote:

The photo has "PSF" cast into the side frame. I haven't been able to
determine the company name for PSF, but wouldn't be surprised if the
"SF" part was "Steel Foundries." There was an American Steel Foundries
plant in Pittsburgh. The date cast into the side frame is 3-51.
Interestingly, the date cast into the right-hand wheel is 1948. I'll

I guess they must have had some old stock, or maybe a damaged wheel
was replaced with an older one.

repost if I can find anything on PSF. In the meantime the following
link provides some history about American Steel Foundries.

http://www.eslarp.uiuc.edu/ibex/archive/nunes/esl%20history/
american_steel.htm

Thanks for the web site, it was interesting.

Thanks,
Brian Botton