It's also not connected by any of the rail lines or busways that Pittsburgh has built over the years. Given the previous cost estimate of $750 million dollars 15 years ago, I'm imagining this 2-3 mile expansion will be a subway. The layout for those not familiar is below. The orange is the existing light rail which includes a downtown subway and tunnels in the hills. The red is the east busway, the first 6.8 mile section was completed in 1983 at a cost of $115 million ($244 2007 or $36M per mile) and the yellow is the currently under construction North Shore Connector which will open up the north side for rail expansion. It's a rather hilly landscape and like San Francisco, one of the reasons the light rail lines were saved is because of their tunnels.
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