The collector in me wants to keep my set intact. The pantographs do lock down, so I'm not concerned there and the warping on the end caps is not bad. The set runs fine and I have no complaints. However, that is just me.
If you are going to make the change, I might suggest MTH Railking truck side frames as they might be closer in scale to the Welz cars. Scale superliner trucks as found on Atlas Horizon cars or K-line cars would be a bit large compared to the cars in my opinion. The same is true for the Williams trucks and side frames. The cross section of the Williams cars is a larger than the Welz ones.
I'm holding out for scale cars and I suspect I they will yet become available in my lifetime.
