Patent ID: 8413592

Claim:
A three piece railroad car truck having a bolster sprung cross-wise between first and second sideframes, said sideframes being mounted on first and second lengthwise spaced apart wheelsets, said wheelsets being mounted to said sideframes at sideframe to wheelset interface assemblies that include self-steering apparatus permitting angular deflection of said wheelsets relative to said sideframes as viewed from above; said bolster having a center plate and first and second ends distant from said center plate, said first and second sideframes being mounted to yaw relative to said bolster; and said truck including a first set of yaw resisting members mounted to work between said bolster and said first sideframe, and a second set of yaw resisting members mounted to work between said bolster and said second sideframe, each of said sets of yaw resisting members including a first yaw resisting member and a second yaw resisting member, said first and second yaw resisting members being independently biased to oppose yaw deflection, said first yaw resisting member being mounted closer to said center plate of said bolster than said second yaw resisting member, said first and second yaw resisting members being co-operable to yield a moment couple opposing yaw deflection of the respective sideframe relative to said bolster, said moment couple having a magnitude increasing as a function of increasing yaw deflection.