Question: Which monorail used to begin the monorail that is a 3.9 mile long monorail mass transit system?
Sentence (from "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.
Relevant evidence: Yes