Rare large railroad map of Pennsylvania, "Published & sold by J.L. Smith Successor to R.L. Barnes No. 27. So. 6th. St. Phila."
In addition to Railroad information, the map shows drainage, counties, canals, railroad stations in red.
This is the First edition, first issue, as noted by Modelski, Railroad Maps of the United States (citing the 1871 edition at the Library of Congress).