Portland neighborhoods owe their location, alignment, and growth to a splendid, 19th-century innovation: the streetcar. This city still bears the imprint of the carlines that once wove their way out to suburbs in every direction, including Fulton, Portland Heights, Goose Hollow, Nob Hill, Slabtown, Willamette Heights, Albina, Saint Johns, Irvington, Rose City, Mount Tabor, Montavilla, Mount Scott, and Sellwood. As routes developed, people used them...