great northern tender jumping track

[pethia]

Have a new steam loco w/ tender.  Curves are 28" and tender wheels are jumping track when long observation cars added (2).  Anyone add weight to tender?  IF yes, how did you do it?

[skipgear]

I'm guessing you mean 28" Diameter or 14" Radius because 28" radius curves won't cause a problem with anything.

Which Great Northen loco? I'm thinking the 4-8-4 Northern with Vanderbilt tender? That tender is fairly light and weight wouldn't hurt it. What passenger car are you using? Does it have body mount couplers?. Body mounts on a long car are going to cause problems on 14"R and below.

[pethia]

sorry...radius is 14" and it is the Vanderbuild .
I read that adding a bit of lead weight would help.  I wonder if the tender comes apart for me to add some lead shot?