Re: Solid, Roller & Friction Bearing Journals

Anthony Thompson <thompson@...>

I wrote:
The roller bearing was indeed not really applied to railroad
practice until the 1920s but was a known principle much earlier in
mechanical design, as Paul has discovered. There was a roller bearing
arch-bar truck introduced in the 1920s (for a photo, see Hendrickson's
article in RP CYC 4).
I forgot to mention that by the 1928 Cyclopedia, there were passenger roller bearing trucks shown (for PRR and SP) but at that time, no freight trucks with such bearings.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705
(510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...
Publishers of books on railroad history

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