operated by pilots until 2014). The guideway is built to the "ALWEG" track standard. For the first seven years, the line only ran as the MGM Shuttle, between MGM and Bally's stations. During this time, two ex-Walt Disney World Mark IV monorail trains were used. Though the Las Vegas and related train equipment appear superficially similar to the original ALWEG design (as exemplified by the Seattle system), their suspension and propulsion systems differ substantially. A Seattle train may be walked end-to-end which is impossible on a Las Vegas or Florida train. The ALWEG Mark VI system used in Las Vegas Monorail consists of two inline large truck tires per car that support the load over the concrete guideway with a rectangular cross section and eight guide tires that straddle the guideway from both sides. The total capacity of the four-car trains is roughly equivalent to two articulated buses at 80 seated and 160 standing passengers. The maximum speed is , although that speed is only reached during one short straight segment of the line. Extensions To Downtown Las Vegas Phase 2, a long extension along Main Street to Downtown Las Vegas was planned, with new stations at the Stratosphere Hotel, Charleston Boulevard, Bonneville Avenue and Main Street Station. Construction was planned to begin in 2005 with service starting in 2008. However, the anticipated funding from the federal government was not allocated in 2004, so the plans were put on hold. On January 27, 2005, the federal government announced that it would not provide money for the $400-million project. The plan was to open the system in January 2004, and for it to cover its debts and operating expenses by attracting 19 to 20 million riders. Since the system was not only delayed in opening, but later shut down for four months, income was not as great as organizers had hoped. This reportedly is a contributing factor for the government's denial of Phase 2 funding. Southern extension Phase 2 was revised to instead extend the monorail system south from the MGM Grand Station to McCarran Field (now Harry Reid International Airport). Providing monorail service to the airport has been an unpopular idea with limousine and taxicab operators in the city, as trips to and from the airport form a major portion of their business. Several hotel and casino owners on the Strip supported the project, and were more supportive of an