Which monorail used to begin the monorail that is a 3.9 mile long monorail mass transit system?
Mark IV monorail: The Mark IV monorail was a design model of straddle-type monorail trains. Mark IV monorail:  Sometime between 1991 and 1994 Monorail Coral and Lime (which had been introduced new in 1984) were sold for $3.5 million each, refurbished, and used to begin the Las Vegas Monorail operations. Las Vegas Monorail: The Las Vegas Monorail is a 3.9 mi monorail mass transit system located adjacent to the Las Vegas Strip, in Clark County, Nevada, United States.
Mark IV monorail