The writer hopes that the author will follow up this subject, and that
other members will join, as a full discussion will no doubt bring some
results on a question which seems to be highly important.
JOHN C. TRAUTWINE, JR., ASSOC. AM. SOC. C. E. (by letter).--In his
collection of data, Mr. Randolph includes two ancient cases taken from
the earliest editions (1872-1883) of Trautwine's "Civil Engineer's
Pocket-Book," referring to performances on the Mahanoy and Broad
Mountain Railroad (now the Frackville Branch of the Reading) and on the
Pennsylvania Railroad, respectively.
In the private notes of John C. Trautwine, Sr., these two cases are
recorded as follows:
"On the Mahanoy & Broad Mtn. R. R., _tank_ Engines of 35 tons, _all
on 8 drivers_, draw 40 _empty_ coal cars weighing 100 tons, _up_ a
continuous grade of 175 ft. per mile for 3-1/2 miles; & around
curves of 450, 500, 600 ft. &c. rad., at 8 miles an hour. (1864)
This is equal to 77-14/100 tons for a 27-ton engine." (Vol. III, p.
176.)
"On the Penn Central 95 ft. grades for 9-3/4 miles, a 29-ton engine
all on 8 drivers takes 125 tons of freight and 112 tons of engine,
tender, & cars, in all 237 tons,[C] and a passenger engine takes up
3 cars at 24 miles an hour (large 8 wheels).
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