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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6
Scope of Tests.
II. The object of the tests can, therefore, be stated in general
terms as follows:—
(A) .—To determine the maximum percentage of emergency brak-
ing power which can be adopted, considering:—
(a) The type of brake shoe to be used.
(b) The type of brake rigging to be adopted.
(c) The type of air brake mechanism and control to be adopted.
(d) The degree to which occasional wheel sliding is to be permitted
under unfavorable circumstances.
(e) The variation in the condition of the rail surface for which it
is considered necessary to provide.
(0 The effect upon the mean coefficient of friction of the width
and length of the plain cast-iron brake shoe.
(B) . To compare the relative performance of the clasp brake
rigging (two shoes per wheel) and the standard brake rigging (one
shoe per wheel) under corresponding conditions with regard to:_____
(a) Maintenance of predetermined and desired piston travel.
(b) Efficiency of transmission of forces.
(c) Effect upon wheel journals, bearings and truck.
(d) A mean coefficient of brake shoe friction for the standard plain
cast-iron shoe.
C. To compare the performance of the Westinghouse Air Brake
Co. s new air brake mechanism (type UC) with that of our present
standard (Westinghouse type PM) brake equipment with regard to:_____
(a) Efficiency and effectiveness, as shown by the length of service,
and emergency stops.
(b) Safety and protective features.
(c) Flexibility and certainty of response to any manipulation of
the engineer’s brake valve.
(d) Uniformity of action of individual equipments associated in
the same train and of any individual equipment at different
times.
(e) Smoothness of riding during stopping, slack action between
cars and the resulting shocks.
(f) Capacity for future requirements.
D. To observe the behavior of the brake shoes as the tests pro-
gressed and note particularly any variation in the results of similar tests
which cannot be accounted for by known changes in conditions outside
of the brake shoe One type of cast-iron brake shoe was to be used in
all the tests. Relating to objects A, B and C, advantage was taken