There was discussion about the need to have railroads as part of the Waze maps (http://www.waze.com/forum/viewtopic.php?f=10&t=5236) and that Waze made a decision not to include them.

Here's why I think that decision needs to be readdressed. GPSs will eventually be able to receive train position warnings when approaching a grade crossing. The concept of an "intelligent grade crossing" has moved out of the concept stage to the R&D stage, and now limited field testing is approaching reality. According to Sam Alibrahim of the Federal Railroad Administration’s R&D office, “We have [funding] to prototype a system that will bring approaching train information inside the vehicle, to the driver.” The same article goes continues, “The systems will need…Global Positioning Satellite technology to receive the information.” (1)

While the current crop of stock, after-market vehicle navigation systems, or smartphones -- as best I can tell -- don't yet have the necessary receiver, when the time comes for this technology to move into widespread field testing, Waze maps need to be ready.

Also see http://onlinepubs.trb.org/onlinepubs/am ... tmeyer.pdf, page 28.

(1) Trains Magazine, August 2011, p14