To obviate these defects Westinghouse in 1872 invented what he
termed a triple valve attachment, by means of which, if the
thing can be so expressed, his brake was made to always stand at
danger. That is, in case of any derangement of its parts, it was
automatically applied and the train stopped. The action of the brake
was thus made to give notice of anything wrong anywhere in the
train. A noticeable case of this occurred on the Midland railway in
England, when on the November 22, 1876, as the Scotch express was
approaching the Heeley station, at a speed of some sixty miles an
hour, the hind-guard felt the automatic brake suddenly self-applied.
The forward truck of a Pullman car in the middle of the train had
left the rails; the front part of the train broke the couplings
and went on, while the rear carriages, acted upon by the automatic
brakes, came to a stand immediately behind the Pullman, which
finally rested on its side across the opposite track. There was
no loss of life. On the other hand, as the Scotch express on the
North Eastern road was approaching Morpeth, on March 25, 1877, at
a speed of some twenty-five miles an hour, the locomotive for some
reason left the track. The train was not equipped with an automatic
brake, and the carriages in it accordingly pressed forward upon
each other until three of them were so utterly destroyed as to be
indistinguishable. Five passengers lost their lives; the remains of
one of whom, together with the wheels of a carriage, were afterwards
taken out from the tank of the tender, into which they had been
driven by the force of the shock.
Public-domain text, read in full here on John Shaqi.
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