The Skytrain is an automated people mover (APM) at Miami International Airport (MIA) in Miami-Dade County, Florida, United States.

The Skytrain was built as part of an airport expansion project, which included the construction of a new mile-long (1.6 km) terminal.

Due to the building's length, the Skytrain built was to facilitate the transport of passengers and reduce walking times.

[1] In the late 1990s, MIA started a $6.3 billion capital improvement program to expand its facilities, which included the construction of a new passenger terminal to be used exclusively by American Airlines.

[5] A contract was awarded in 1999 to Mitsubishi Heavy Industries (MHI) and Sumitomo Corporation to build the APM vehicles, which were completed in Japan by 2005.

[10][11] The Skytrain travels across Concourse D and serves passengers in the airside zone who have cleared airport security.

[27][28] Since its opening in 2010, Skytrain operations and maintenance (O&M) have been provided under contract by Crystal Mover Services Inc. (CMSI), a joint subsidiary of MHI and Sumitomo Corporation.

[19][29] On December 22, 2015, a train collided with the buffer stop at the end of the track at Station 4 during an overnight maintenance test.

Passenger service was suspended for investigation, and the cause of the accident was ultimately determined to be the result of a short circuit which disabled the train's braking system.

The circuiting was modified to remove the brake bypass function during normal train operations, and passenger service resumed on December 26.

[18] Engineers discovered extensive cracking due to "accelerated deterioration" of the concrete in three of the piers under the tracks near Station 1 and recommended an immediate closure of the system.