Thanks for reading.  We have a White Christmas Express and it is giving us problems. It's a 4-6-0.  The front axle of the lead wheels will not lay flat on the track and the second axle ends up derailing itself as the truck flails about.  If I reach in and try to press the front axle to the track the front row of drive wheels wants to lift slightly.  I'm surprised at how much play there is in this front mechanism and my inclination was to try to fasten the lead wheel arm to the truck toward the back near the second axle to sort of pull up the back axle.  However, it seems like it needs that freedom to swing a little there in addition to the main pivot as the train moves in to the curve.  Any thoughts on what might have happened or how to remedy it would appreciated.