I have used E-Z track over the years (all Nickel-Silver, Gray Roadbed) and just noticed a difference on the bottom of varies pieces of 9" straights and 22" curves that I use. My older track has no holes to nail down the track if you so desire and are hard to pull apart and others have the holes and are easier to pull apart. Now some new track that I just bought have the holes and have a black tie showing thru on the bottom on both the top and bottom underneath and are really easy to pull apart (like this part). Probably some useless information but thought I would ask on the forum to see if the track HAS improved over the years and should replace some of the older track, thou all my pieces work fine thou some are hard to pull apart.