What is an AAR type or 7a truck?
Chester Zmijewski
cmzmijewski@comcast.net
First off ---> .
AAR - Association of American Railroads
There are 3 general styles of RR truck sideframes (that we as modellers should keep in mind).
archbar - A common early century design. Some of these lasted under MOW and caboose fleets.
Bettendorf - middle century design.
roller bearing - most modern design that you will see trackside today.
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