Mark IV monorailとは 意味・読み方・使い方

The Mark IV monorail is a design model of monorail trains. The design was developed by Bob Gurr. Ten were built by Martin Marietta in 1969 at the cost of about six million USD each and they were used on the Walt Disney World Monorail System between 1971 and 1989 before they were replaced by the Mark VI monorail, although a few lasted until 1990. The Coral and Lime trains were sold for $3.5 million each, refurbished, and operated on the Las Vegas Monorail. They have since been replaced.