It is 12 foot total, three four foot modules strung together. The two NTRAK back tracks swing back behind a view block behind some trees to give the illusion of a singe track through town, only to join together again to the NTRAK standard three track at each end of the 12 foot block. There are a few photos and videos of it in this thread.
The depth is anything but standard. The two ends of the 12 foot set are 2' 2" where they join up to standard modules. The three tracks are all set back the extra two inches so the front of the modules stick out by that much giving more room for buildings and scenery. The middle module is 2' 8" deep so the two end modules are trapezoids that expand back to that dimension where they join the middle module.
