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The difference is that when a sidewalk or park is ruined and un-walkable then it's cheap and easy to just put up some orange cones. So the cost of failure is basically zero.

Not the case with the 4 train, or the L, or the 2-3. Those trains can't fail. So it's very expensive to make sure they don't. Nobody cares if Madison Square Park is blocked off for a day. (Maybe except the vagrants).

But the city will literally grind to a halt if the green or red lines aren't running.