On the beamway at certain points there are transmitters. These MAPO transmitters send an electrical signal through the track. When a train is on the track, it blocks that signal.
These transmitters correspond to locations on the beam called Holdpoints. The holdpoints are located at certain numbers, which must all be committed to memory (your memory, not the train's)
Each train has a receiver that can tell how many of these signals it is receiveing. Say Monorail Red is driving behind Monorail Blue. If there are four transmitters between the trains, Red will only get four signals, because all the signalls ahead of Blue are blocked by that train's presense.
If Red gets within two holdpoints of Blue, the train's MAPO receiver will say "Hey, you're gettin' close buddy!" and turn on an amber light on the console with a beeping alarm. At that point the driver consults his super-keen monorail-intellect and figures out where the next holdpoint is. He then stops there and tells all the passesngers that the train is "waiting for further traffic clearance."
If Red doesn't stop at that holdpoint? When he passes over the transmitter at that holdpoint, and his MAPO is then only receiving ONE signal, the train will automatically assume the driver is insane: "Hey this idiot is tryin' ta dent my nose!"
The train puts on 85-90 psi air brakes and stops on a dime, then you get canned. Well actually you're allowed three "overruns" (the term for crossing the line). If however you do something that is really dangerous, Good Bye. Three overruns is the limit for your entire career. They never go away.
What do we do with overrun victims? Send 'em to Buses of course!
What does MAPO stand for?
MAPO is a subsidiary of WED (Walter Elias Disney) Transportation. The name is short for Mary Poppins.
The MAPO system is also called the MBS (Moving Blocklight System).
REPORTED: Chris 13 FEB 00