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In page Walt Disney World Monorail System:

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A red MAPO will also occur when the pilot approaches a section of un-powered beam, a spur line, or a switch beam thrown in the direction of a spur line. Pilots must engage the MAPO override when moving trains through a switch to the spur line. Red MAPOs occurring due to safety tests, switching, or beam power loss do not count as demerits against the pilot.