It's interesting to note, that even Zluuzki agrees that non-existent rails shouldn't be mapped because it becomes too crowded when overlaid with existing items.  They mention it here and in their diary/page.

"I deleted all ways on the overbuilt part, and left them were they aren't overbuilt. It would get too crowded otherwise."

But yet, these types of ways keep getting added back, and occasionally connected to roadways with railway crossing nodes being placed where there are none.