I had posted this on another thread but since the discussion seems to be here...
Like many, I had always been under the impression that there would be a computer override if the trains got too close?
From another forum:
How do you keep from crashing into each other?
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.
More interesting info about monorail operation can be found here
http://forums.wdwmagic.com/showthread.php?t=426366&highlight=mapo
I'm sure there will be tons of speculation but think of the odds of a simulataneous driver error & system malfunction?
Sympathies to the family.