Through Truss TT Bridge

[NW Mailing List]

The discussion on this subject seems to have wandered somewhat from the original question, but I would respectfully like to offer a few comments.

N&W Motive Power Dept. Data Book No. II (Roman numeral), listing "Miscellaneous Equipment," revised May 19, 1953, shows that the turntable at Joyce Avenue in Columbus, installed in 1930, was a "115-foot twin span," which I take to mean a "through truss."  No other TT's on the system were so designated.

As for "yard" and "road" coal, part of the difference may have related to size.  However, as I recall, the principal difference was that "yard" coal was "low volatile," intended to reduce smoke in urban areas such as Roanoke, Portsmouth and Cincinnati.  It worked especially well in hand-fired engines such as the S-1 switchers but did not work as well in road engines because,  as I recall, it had a  tendency to "clinker."   Therefore, most stoker-fired road engines used "high volatile" coal.  

Louis Newton       
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