http://www.monorails.org/index.html
here is a site that give some informantion about monorail costper mile and the year they were built
http://www.monorails.org/tMspages/HowMuch.html
what its says its
How much does Monorail cost?
This is the number one question we receive at The Monorail Society. Unfortunately there is no simple answer. There are many variables which influence the price of building a monorail system (and most forms of rail transit). Factors include...
Total length of the system: In many cases, costs can be reduced the longer a system is.
Topography: Is the terrain flat or hilly, are there many roads or rivers to cross?
Location: What is the access for construction equipment? Will there be heavy traffic or other impediments to construction?
Utilities: Relocation of water mains, power lines, telephone lines, etc. can have a significant effect on cost increases.
Land: What amount of land needs to be purchased or easements need to be acquired?
Passenger requirements: What size and number of vehicles are required? How much time will they wait at stations?
Speed: What are the speed requirements of the system? Are there long enough distances between stations so that a higher speed is desired?
Number of Stations: Each additional station adds to the cost.
Special Structures: Will tunnels, bridges, overpass reconstruction or urban structures be a factor?
Geotechnical conditions: What are the subsurface conditions? They can have a major impact on foundation costs.
Environmental Mitigation: Will restoration, wildlife protection or sound walls be required?
the Las Vegas Monorail which has the Bombardier MVI cost $88 million/mile in 2004
it has 7 stations and 4 miles of track that would be about $352 million