There are actually THREE monorail routes (with multiple trains running on each route).
On each route, the trains will "loop" around and around on their own unique track.
1) "Epcot Monorail" TTC > Epcot > TTC > (loop runs clockwise)
2) "MK Express Monorail" TTC > MK > TTC > (loop runs counter-clockwise)
3) "Resort Monorail" TTC > Poly > Grand Floridian > MK > Contemp. > TTC > (loop runs clockwise)
As you can see, you can transfer from or to any monorail at the TTC (which is also the MK parking lot).
You may ride any and all of these, if you like.
They do not "let you out" INSIDE any theme-park,
so you don't need a park ticket.
"Por favor mantengase alejado de las puertas."