ExCon90
Thanks for actually answering my question. Have other railways around the world had trouble with hunting on straight track by wheelsets that match the track gauge, or was WMATA's original decision based on speculation by someone who was new to the business? Or is it standard industry practice which somehow never gets mentioned?
Hunting is an issue that has been know about for more then a hundred years. Lateral dampening in the truck suspension design has reduced it. Rolling stock center of gravity also has an effect on hunting. In the case of WMATA Metrorail reducing the track gauge reduces the lateral movement even more.
It should be noted that track gauge is nominal. It is increased in curves based on the sharpness of the curve and the amount of super elevation.
John in the sand box of Maryland's eastern shore.