Disneyland's PeopleMover closed in 1994 (?). The original ride
system had speakers in each car to provide the audio. It went through
sections such as the Speed Tunnel and, later, a TRON themed tunnel.
In 1998 a new ride opened as the Rocket Rods, a high speed E-ticket
ride around Tomorrowland. Unfortunately, technical problems plagued
the Rods and the ride quietly closed in 2001.
Trivia: Disneyland's PeopleMover was very low tech. The
motorless vehicles were moved around the track by electric driven
rubber tires. (The Matterhorn
Bobsleds are also propelled this way.)
The classic PeopleMover became the Tomorrowland Transit Authority
in 1994. The front area of the PeopleMover track received a fancy
cosmetic update, but the rear sections (near Space Mountain) are
the same old familiar white pillars that we got used to in the 1970s.
A new soundtrack was put in place themeing the ride as a tour of
Tomorrowland as it makes version stops (though it never really stops)
at locations through the land. The audio plays through speakers
in the ceiling as the vehicles pass under them.
Trivia: The Magic Kingdom's PeopleMover is powered by magnets.
Linear induction moves the vehicle. A similar system can be found
at the Disney/MGM Studios at the Rock 'n Roller Coaster. Technology
advanced alot between the 70s and 90s.