Huh, it looks like the author of that older map might not have realized that "Pennsylvania 6-5000" is about the telephone number of a hotel in New York City (whose telephone exchange was named after Pennsylvania Station, which was named after the Pennsylvania Railroad, which was named after the Commonwealth of Pennsylvania).
https://en.wikipedia.org/wiki/Pennsylvania_6-5000_(song)
https://en.wikipedia.org/wiki/PEnnsylvania_6-5000
https://en.wikipedia.org/wiki/Hotel_Pennsylvania
https://en.wikipedia.org/wiki/Pennsylvania_Station_(1910%E2%...