You are free to use the Monorail system. The only thing that we ask is that if you are traveling between the MK and the TTC, to please use the Express Monorail if it is open. Before 8:30, and after Express shuts down, you are welcome to use the Resort Monorail.
Hours of service are as follows:
Resort Monorail: 7:00am-11:00pm
Express Monorail: 8:30am-one hour after MK closes.
Epcot Monorail: 8:00am-10:30pm