Interesting tile blog: https://tilesinnewyork.blogspot.com/2012/08/subway-tiles-part-ii-heins-and-lafarge.html
Google images: https://www.google.com/search?q=nyc+subway+tiles&num=50&safe=active&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjEy8rp4YjSAhUL64MKHftwDRQQ_AUICCgB&biw=1403&bih=802
Oh, I like this!
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