Brake Tests
År: 1913
Forlag: Pensylvania Railroad Company
Sted: Altoona, Penna.
Sider: 401
A Report Of A Series Of Road Tests Of Brakes On Passanger Equipment Cars Made At Absecon, New Jersey, In 1913
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49
features which are essential in a brake that will insure the most satis-
factory results under existing mechanical and operating requirements.
These functions briefly stated are:—
(a) Operation harmonious with the older types of brake equipments
in common use.
(b) Adaptable to extreme ranges of present service requirements
and capable of extension without modification in essential details as
service requirements may change.
(c) Certainty and uniformity of operation in service applications
to the greatest possible degree.
(d) Maximum, predetermined and fixed flexibility for service brake
operation.
(e) Sensitive to release to the maximum degree consistent with
stability.
(f) Minimum sensitiveness to the unavoidable fluctuations in brake
pipe pressure tending to cause undesired light service brake applica-
tions, brakes creeping on, etc.
(g) Brake application simultaneous on all cars throughout the train.
(h) Maximum protection against complete loss of the brakes due to
the failure of any portion of the system.
(i) Quick recharge of storage reservoirs and consequent ready
response of the brakes to manipulation by the engineman.
(j) Graduated release of brake cylinder pressure.
(k) Conservation of brake pipe pressure during release.
(Z) Protection against loss of brakes due to inadequate pressure with
which to release and recharge.
(m) Emergency retarding force sufficient to stop the train in approxi-
mately one half the distance of a full service application stop.
(n) Maximum emergency pressure obtainable in the shortest
possible time on the train as a whole.
(o) Emergency brake cylinder pressure held without blow-down
during the stop.
(p) Elimination of undesired quick action.
(q) Full emergency brake cylinder pressure obtainable at any time
during or after a service brake application.
(r) Full emergency pressure applied automatically when a prede-
termined excessive over-reduction in brake pipe pressure is made.
(s) Quick action obtained automatically in case the brake pipe pres-
sure is depleted below a predetermined danger point, due to leakage
or any other cause.