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offered the Barber Lateral Motion Device, which could be fitted
to almost any type of freight car truck. This consisted of self-
centering rollers between the bolster and the top of the spring
package (26). Many trucks made in the 1920s through 1940s
incorporated this device (3, 23, 25, 28, and 40).
Dalman trucks
The Dalman Two-Level truck, introduced ca.1922, was an ARA
standard design with the bolster and side frames modified to
accommodate more, and softer, springs. Owing to its improved
riding qualities, it was widely adopted during the 1920s on all
types of freight cars (27 and 28). Later, a One-Level version of
the Dalman design was introduced in which the outer springs
of the spring package were at the same level as the other
springs, rather than being offset vertically (29). The Dalman
One Level truck was equally-popular for a brief period in the
27
27: This 50-ton Dalman Two Level truck offered improved
riding qualities by providing more and softer springs.
There were six pairs of springs on each side with the
spring seats for the outer pairs slightly offset vertically,
hence the Two Level designation.
Freight Car Trucks - 11
28
28: Clearly visible on this version of the Dalman Two
Level truck are the seats and rollers of the Barber Lateral
Motion device between the bolster and springs.
29
29: The Dalman One Level truck worked exactly like the
Two Level Dalman, but the spring seats were all at the
same level instead of being "stepped."
late 1920s and early 1930s. The Dalman arrangement was
even applied to Andrews trucks; cars of a few railroads, nota-
bly the Great Northern and Seaboard Air Line, were equipped
with Dalman-Andrews trucks in the 1920s (30).
index contents
MRH-May 2013