Due to the length of the EPCOT BEAM this is possible, they just may have more traffic holds while you are on your way to or from EPCOT to TTC. I'm not sure about the two MK loops, but, this is less likely as there is not enough distance between trains. I would think that any more then 3 trains on the MK beams and the trains would sit for a long time at each station as they would not be able to leave station till the train in front left their station, and so on. But, I'm no monorail expert by any means.