But I couldn't find any information about it online. I figured it was in Philadelphia, of course, and my guess is that it's for L.C.L since most of the Speed Witch is.
Then I found this map.
And there is is, toward the lower left, at the east end of the 52nd St. Yard - Phila Transfer L.C.L.
Interestingly, the map not only lists the stations (which in railroad terminology designates a town that has a passenger station and/or freight house and/or team tracks or bulk tracks in NH terminology), but whether they take L.C.L or carload traffic.
But even more interesting is that at the beginning of the NH Arranged Freight Service books, it lists PRR classifications as well. One of the classifications is Speed Witch (another is the aforementioned Philadelphia Transfer), and all of the stations classified as Speed Witch appear on this map:
Bridesburg, Pa. Carload
Bustleton, Pa. Carload
Dock St. Phila., Pa. Carload
Engleside, Phila., Pa. LCL and carload
Fairhill Station, Phila., Pa. LCL and carload
Frankford, Pa. LCL and carload
Holmsburg Jct, Pa. LCL and carload
Kensington Sta., Phila, Pa. LCL and carload
Midvale, Pa. LCL and Carload
North Penn, Pa. Carload
North Phila., Pa. LCL and carload
Norris St., Phila,. Pa. Carload
Ontario St., Phila, Pa. LCL and carload
Sears Sta., Phila., Pa. LCL and carload
Shackamaxon Sta., Phila., Pa. LCL and carload
Tacony, Pa. LCL and carload
Tiaga St., Phila., Pa. Carload
Vine St., Phila., Pa. Carload
Taken from NH Arranged Freight Service #79 (April 25, 1950).
So not only do I have more information for where these cars are going, but also whether they would be LCL or carload. Incidentally, my suspicion was that the carload shipments are for team tracks, not industries.
And as it turns out, I can look that up too. I happen to have a copy of PRR C.T. 1000 for May 1, 1945 - List of Stations and Sidings and Instructions for making Reports to the Superintendent Car Service. This lists every siding, private and railroad owned, on the PRR.
So looking at a couple of the entries, say Bridesburg and Tacony. In addition to all of the industries (and a couple of storage sidings) listed in Tacony, it also lists at mile marker 76.9 (from Jersey City Passenger Station) Freight Station and Public Delivery. In Bridesburg it lists at mile marker 78.7 just Public Delivery. The freight station entry is self explanatory, with Public Delivery the designation for what modeler's tend to call a team track.
These will all provide some interesting destinations for waybills on the layout.
As a bonus, recently Ted Culotta mentioned a book on his Speedwitchmedia.com called The Railroad Freight Service. While it's nice to have a hard copy, you can view this book in its entirety at Hathitrust here. Just scroll down and select which copy you'd like to view, two universities have scanned it. As Ted said, it's a very helpful resource.