I was given Atlas sectional track that was likely purchased in the 70's, maybe even late 60's. Am I wrong, or was there a change and improvement since then in the rail material used ? Is there an easy way to tell if I have the better track or not ? The track is in the original boxes and I would like to use it but I don't want to use it if it's going to mean continual unscheduled stops. Thanks for any input.