You can have as many as you like, ive done up to 4, 3 sitting, each advances and takes a loop on his own, with 4 activation sections, and with the throw of one switch you have a nonstop loop, now 4 wouldnt work with the reversing Y, but 2, 1 traveling, 1 stopped, alternating trips, wouldnt be hard at all, and No cost, no relays, no sensors, just pull out the street pins and add some wire...
the Y would be lightly sprung, allowing taxi to leave then points close back....just a thought...
