On the plane to Tempe this Saturday, i saw a great article in the Times about the ongoing renovations of the Fulton Street Station.
The author, who opens by claiming the station is something inspired by M.C. Escher, describes the craziness of this stop and the challenges in renovating it. Many people forget that before June of 1940 the Subway system of NYC was owned and operated by 3 different authorities, the IRT, the BMT, and the IND. Wherever there are stops in which these lines intersected, the stations are similarly a mess. Train lenghts, platform standards, fare collection, and transfer rules differed from line to line. This legacy has lead to many of the problems at this station and others in the system.