Detroit has no rail except the Detroit People Mover, which is a 2.9 mile elevated loop that runs through the downtown. It's never made any money since it was put in during the "dark years" in Detroit (the 80's).
Detroit also has DDOT (Detroit Department of Transportation) bus service throughout the city, but I wouldnt ride it without a bullet proof vest. DDOT buses connect with SMART (Suburban Mobility Authority for Regional Transportation) buses that run into the suburbs. Light Rail and commuter rail services have been proposed, but due to the condition of the City of Detroit (high crime rate), the suburbs shoot down any proposal put their way. Basically, nobody wants to be connected with the City itself because it's so bad. The sad thing about this is, Detroit had one of the greatest mass transit systems in the country back from about the turn of the century right up to 1956, when electric trolley service ceased. In 1945 Detroit's transit system (including electric trolley, bus, interurban, and commuter rail) had 490 million rides..
Currently the proposal on the table for connecting the Metro area is "SpeedLink".. A high speed bus network running on deticated roads. This is supposed to cost less than Light Rail. This system is supposed to run like Ottawa, Ontarios "Transitway" for those of you familiar with it. I think it's dead in the water, however.
Transit Windsor (Windsor, ON) runs a reliable and safe system in Windsor, and connects with DDOT on the Detroit side of the tunnel.
Ann Arbor, MI (home of The University of Michigan) has AATA (Ann Arbor Transit Authority) which runs buses throughout Washtenaw County, including: Ann Arbor, Chelsea, Manchester, Saline, and Ypsilanti. This system is clean and reliable with almost brand new equipment.