Dwelling on NYC commuter rail esp Metro North...I wanna endorse subway interoperations but seems very impractical here...
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In a city like Boston, all four subway lines make use of former (or current) mainline alignments--interoperation would be more practical
London also has this pattern--and I think it's pretty typical in Germany and some other European countries
Which pattern? New York's? Or Boston's?
Boston's pattern; using former or current mainline alignments for subway service
It helps that their system has much less track to replace as well I imagine.
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