Question: Which monorail used to begin the monorail that is a 3.9 mile long monorail mass transit system?

<P0-S0> The Mark IV monorail was a design model of straddle-type monorail trains. <P0-S1>  The design was developed by legendary Disney Imagineer Bob Gurr. <P0-S2>  Ten trains were built by Martin Marietta in 1969 at the cost of about $7 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 1991. <P0-S3>  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. <P0-S4>  In 2004 Lime and Coral (now the MGM and Bally) were replaced by fully automated Bombardier MVI 4-car trains. <SEP> <P1-S0> The Colombo Monorail is a proposed monorail system to be built in Colombo, Sri Lanka. <P1-S1>  The project is estimated to cost US$1.3 billion. <P1-S2>  Construction was proposed to begin in 2Q 2015. <P1-S3>  However a Japanese JICA transportation master plan for Colombo did not recommend a Monorail as a priority and recommended a Bus Rapid Transit (BRT) , Railway electrification an overhead light rail system instead. <P1-S4>  A separate study by the Ministry of Megapolis and Western development (see below for more information) also revealed that a Light Rail system is much more feasible than Monorail and decided to go with a Light Rail system, electrified railway system and an Inland water transport ( a brand new boat/ferry service that utilises Colombo’s historic canal network) under the Western Region Megapolis project. <SEP> <P2-S0> 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. <P2-S1>  It connects several large casinos in the unincorporated communities of Paradise and Winchester, and does not enter the City of Las Vegas. <P2-S2>  It is owned and operated by the Las Vegas Monorail Company. <P2-S3>  In 2013, total annual ridership was roughly 4.2 million, down from a pre-Great Recession peak of 7.9 million in 2007. <P2-S4>  The monorail is a registered not-for-profit corporation, allowed under Nevada law since the monorail provides a public service. <P2-S5>  The State of Nevada assisted in bond financing, but no public money was used in construction. <SEP> <P3-S0> Patiala State Monorail Trainways (PSMT) was a unique rail-guided, partially road-borne railways system running in Patiala (British India) from 1907 to 1927. <P3-S1>  PSMT was the second monorail system in India, after the Kundala Valley Railway, and the only operational locomotive-hauled railway system built using the Ewing System in the world. <P3-S2>  The Kundala Valley Railway pre-dated this, also using the Ewing system between 1902 and 1908, although this only used bullocks for haulage. <P3-S3>  Following the conversion of the Kundala Valley Railway from a monorail to a narrow gauge railway in 1908, PSMT was the only monorail system in India until its closure in 1927. <P3-S4>  These were the only instances of a monorail train system in India, until the Mumbai Monorail was opened on 2 February 2014.