Reading many of the descriptions of the types without supporting pictures of each is very teasing. I found some examples (mostly via wikipedia):
Metro: https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Me...
Electra: https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/El...
Caledonia: https://s-media-cache-ak0.pinimg.com/originals/3b/91/30/3b91...
Initials: https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Dw...