Pennsylvania Railroad 2-8-0 Consolidation type steam locomotive # 3500. Chicago Illinois USA. November 20th, 1948., a photo by Eddie from Chicago on Flickr.
I found this photograph on the internet a few years ago.
The Pennsylvania Railroad operated steam locomotives on freight and passenger trains in to the mid 1950's.
Seen here possibly on the southside of Chicago, is Pennsylvania Railroad H 9 class 2-8-0 Consolidation type steam locomotive # 3500 in November of 1948. The Prr primarily used this type of steam locomotives, on local freight trains.