They have been doing extensive maintenance on the F near me and shutting it down every weekend. I can either take the shuttle bus, but it's usually faster to wa

They have been doing extensive maintenance on the F near me and shutting it down every weekend. I can either take the shuttle bus, but it's usually faster to walk 20 minutes to the B/Q line. They are also doing massive upgrades and maintenance on the L line, but the J/M/Z parallels much of the L's route. This is fine, it makes sense to do that. It is not as useful to shut the entire system down each night. It makes much more sense to shut parts of it down piecemeal. NYC's subway network is vast. It actually used to be three different systems that were merged together. The numbered and lettered lines have separate maintenance facilities and hardware. What's truly unique about NYC's subway, is how redundant it is. Most neighborhoods are serviced by more than one line. When I lived in Washington Heights (northern Manhattan) the 1 line needed emergency maintenance when a roof in a station collapsed, and I believe that reconstruction took almost a year, but the A/C parallels the 1 by only a few blocks.