Sandsled,Sandsled wrote; I guess ideally I would like a 2 lane mid twenties (24-28') track for testing, kids (and dad ) having fun that can fit in the basement without, uhm, rennovating.
To follow up on the suggestion from FatSebastian, Best Track sells a one lane test track in a 20ft. or 35 ft. length. Each section of lane is 7 ft long so if you wanted to leave off the last section of track it would be 28 feet long overall.
I don't believe the 20 footer is expandable however the 35 ft. test track is. You can add lanes at a later date.
Just my .02 cents worth!