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The GE and GM/EMD patents all talk of self-steering trucks to avoid the above misunderstanding. The following linked website has a good description of EMD's HTCR-truck: <a href="http://www.okthepk.ca/dataCprSiding/articles/200307/trucks.htm">http://www.okthepk.ca/dataCprSiding/articles/200307/trucks.htm</a> Here is a link to GE's patent: <a href="http://www.google.com/patents/US6006674">http://www.google.com/patents/US6006674</a> and the isolated linkage that moves the axles: <a href="http://patentimages.storage.googleapis.com/pages/US6006674-2.png">http://patentimages.storage.googleapis.com/pages/US6006674-2.png</a> As the truck frames are not rigid the lateral resistance of the first axle entering the curve is high enough to align it in radial direction. The linkage transfers that relative movement from perpendicular to the truck frame to the other axles having all axles aligned radial. I hope I understood correctly otherwise correct me please. Regards, Volker
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