Detroit Subway Map

[DetroitPlanner]

Of course the tunnel bus provides a linking service today, but an enhanced link would be a wonderful thing, and not out of the question from a technical or operational standpoint. Amtrak trains cross at Niagara, for example, so it can be done.

As an aside, prior 2005, Amtrak used to cross at Port Huron as well. Port Huron is not really transit, though it is transportation. Amtrak typically is charged with moving people inter-city; not within a region. It is sort of like comparing flight patterns to bus patterns; you can do it, but it does not get you anywhere. The best you can hope for is to improve peak hours service to the airport. http://en.wikipedia.org/wiki/International_Limited