http://www.nytimes.com/2016/12/19/technology/google-digital-maps-railroad-crossings-ntsb.html?_r=0
http://www.progressiverailroading.com/federal_legislation_regulation/news/NTSB-wants-rail-crossing-alerts-added-to-navigation-apps–50438
http://www.iculture.nl/nieuws/apple-kaarten-spoorwegovergangen/
WOW - always amazed when someone uses OSM data for something. The second round of MapRoulette Railroad highway crossings are 33% complete -
[Crossing Ways: Highway-Railway, US] http://maproulette.org/map/980
[Crossing Type: Highway-Railway, US] http://maproulette.org/map/990