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30
30: The Dalman Two Level design was adapted to the
Andrews truck, as shown here. Note that when this truck
was photographed after World War II, one spring on
each side had been replaced by an ASF Simplex friction
snubber.
After-market friction snubbers
In the late 1920s after-market snubbers began to appear which
employed various friction devices to reduce uncontrolled
shocks and harmonic oscillation. All of these were designed
to replace one spring on each side of an existing truck. All of
the major railway equipment manufacturers eventually had
their own patented snubbers (30 and 31), and these became
increasingly popular in the 1930s through 1950s as an eco-
nomical way to improve the riding qualities of trucks that were
already in service, rather than replacing them with entirely
new trucks.
31a-31f: It seemed as if every railway equipment
manufacturer developed its own design of friction snubber
spring replacement to dampen unwanted movement and
harmonic oscillation. Here are, in alphabetical order, the
ASF Simplex, Cardwell Type A, Frost #360, Holland A-6-A,
Miner C2XB, and Symington SBS.
Freight Car Trucks - 12
31a 31b
31c 31d
31e 31f
index contents
MRH-May 2013