Double Track
One of the best things BRIO ever did, in my opinion, was to introduce Double Track. They were selling the regular and parallel switches that would let you put two tracks next to each other, as well as the Cross & Switching Track, but you could not really have them both make a turn alonside each other because all there was were short and large single track curves. Enter 1997 when BRIO introduced double track curves, in both short and large variety, as well as long straight double track. Unfortunately they were only sold for 3 years and 1999 was the last year for these to be in the line-up.