I tried once to track down the Detroit street cars in Mexico City, nothing doing, they have all been scraped. The subway system here is the 4th busiest in the world and the above ground "metro bus" would be a great example of what Detroit could do. I think the best bet would be to have that nice railed spinal cord up woodward [[rubber wheels or not) and compliment the rest with platform bus routes, which could be very fast to implement. The best of both worlds.