@CBS072 posted:It has been 9 years or more the last time I saw the layout, I think each track had 3 tubes blowing air,, They may of had a valve on each of the tracks so to only turn the air on to the track that they were using, I remember they had a 10 gallon air compressor, but I do not remember how many times it started each day of the show. I will look to see if I have other pictures of the layout.
I find a picture of the all of the yard tracks, but it is hard to see the air tubes, I think they white in color, Also may have a row of tubes that are black also.