when my kids were young we had a CN Hustler set up on a 4X8 in the basement.  It's been packed away for 25 years but with a 5 yr old grandson coming at christmas I figured I would get it out.

This is a basic set with locomotive plus 3 cars and there are a ton of extra tracks stored with it - i think we had a basic figure 8 with a flyover.

I set up the 36" circle and got the locomotive running well enough.  I can not get any of the cars to stay on the track behind it though.  It seems like the cars are so light that the spring of the connectors is enough to push them off the track on a curve. Weighting the hopper car seemed to help a bit but it still came off after a few minutes.

So: clearly i need to clean the tracks and maybe buy new joiners.  Is there anything else that would help with the derailing?  Any other general tips?