2 ms·

So you fix the server case by a share nothing design. Put all data on 3 unrelated servers and query the fastest one. Not sure how you do this with subway track

• couchand 9y ago
  We'll just do the same thing. Call the three systems BMT, IND, and IRT.
  • brianwawok 9y ago
    Touche! That raises the costs a bit though, if you actually had full service via 3 lines. Public transpo is already insanely expensive per rider over the 10-20 year term.
• Joeri 9y ago
  It's not the track that breaks down, it's what runs on it. I don't see a reason why the electricity or signaling infrastructure can't be redesigned to have redundancies built in. If the aim with modernization is to replace old signals by new signals and still have just a single signal, that is still inviting calamity.