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EARLY Duryea underframes were banned sometime around 1971 or
Duryea underframes (mid 1950's) were never banned, as far as I
can been able to find.
On 3/3/2020 1:26 PM, Garth Groff and Sally Sanford wrote:
Ed Bommer said (in part):
"The Duryea design reduced much of the stress from
rough handling on the car body and its framing by
isolating and spring-loading the center sill. A major
problem with it was the need for special tooling and
skills to repair it, for which not all railroads were
equipped to handle. As Duryea under fames aged, increasing
maintenance and repair work was required. They were banned
from interchange service in the 1960's."
Banning Duryea underframes must have put a big dent
in the fleets of some railroads and some private owners,
probably hastening the end of older cars. Nearly all the
D&RGW's 40' steel boxcars, for example, were
Duryea-equipped, and some survived in MW service into the
UP-era. The ATSF was also a big Duryea user, and there
were a lot of Duryea-equipped URTX refrigerator cars.
OTOH, the Western Maryland had numerous Duryea-equipped
cabooses which survived until the end of caboose
operations in the 1980s under the Chessie System. A few
still survive at museums or for non-railroad uses,
including one still in Staunton, Virginia which I was able
to crawl under to shoot pictures of the underframe (when I
was much younger and more agile!).