Wait, I think I'm having an epiphany here...
An ex-Disney employee who was fired for auspicious reasons has gone mad and placed a bomb on one of the monorails, yet no one knows which color. If this one monorail drops below 33 miles per hour it will explode. Each monorail on all three lines is completely packed with guests whirring around the MK and Epcot tracks.
As it looks like the Fab Five is closing in on which monorail might contain the bomb; the madman (probably MKT) blows out a section of monorail track on the Epcot line.
At this point the Rescue Rangers along with Darkwing Duck swing into action and quickly fell a few pines near the line and make-up a solid ramp that allows the Epcot monorail to jump the gap.
(anyone want to pick-up the story from here?)