What would you call "track" and "rail" in Portuguese? Track is the whole thing, while a rail is one of the two long pieces of metal where the train lays its wheels, e.g. the right rail.
rail:
http://www.ikonet.com/es/diccionariovisual/images/esp/corte-de-un-rail-117780.jpg
Could they be:
- track - trilho m, linha f
- rail - trilho