Public transit works well in high population density areas. Many european towns and cities are high density because they were constructed in time periods when walking was the most practical means of day to day transportation. As such, public transit works well in europe, but not in most sprawling US cities and towns.
The handful of cities where it does work well are particularly dense, like New York. It seems reasonable to me (though not necessary as these rail lines already exist) to link these population centers since people can get to and from the stations without a car. As was said above, if you need a car to get to the station and from the station to your destination, it doesn't make much sense from a convenience or financial standpoint.
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