Bachmann 4-8-4 Northern track issues

[lonesomewhistle]

I have a Bachmann 4-8-4- Northern DCC equipped. This locomotive is very sensitive to track irregularities in that it will derail easily. The locomotive is not yet a year old since purchased. We have run other 4-8-4 locomotives over the same track after my Bachmann derailed and those locomotives do not derail. Two issues that I suspect: No 1- The pilot wheels are very loose(Locomotive came that way) No-2 It would seem to me that there should be some up/down movement of the drivers even if very slight. Does anyone suggest a fix for this?

[hawaiiho]

I found the same thing. I must add, that this occurs mostly on the tighter radius track.
I have few problems on my 26"curve loop

Will.