Most all EPCOT ride lines can accommodate a wheelchair o mobility scooter (ECV). ECV users have the option of parking and walking through the line, using a fast pass or the DAS card system.
Some rides can accommodate a wheelchair on the actual ride. Very few can accommodate ECVs on any rides.
Learn more about renting scooters at Epcot.
EPCOT has a description of accommodating guests with disabilities and the Disability Access Service card available on line here: https://wdpromedia.disney.go.com/media/wdpro-assets/help/guest-services/guests-with-disabilities/wdw-disability-access-service-card_2014-11-19.pdf