Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Suburban and interurban bus companies listed in the Russell's Official National Motor Coach Guide, which was primarily a resource for intercity bus lines.
Capitol Bus Co./Capitol Trailways (Harrisburg to Hazleton to Wilkes Barre)
Reading Transportation Co./Reading Trailways (served Philadelphia and Allentown and Reading and Shamokin and Harrisburg and Lancaster)
Gettysburg-Harrisburg Transportation Co. (to Gettysburg, until 1948)
Moore's Bus & Taxi Service - city service in Middletown.
Fahrney Bus Co. - served Carlisle, Newville, Shippensburg, Walnut Bottom.
Indian Coach - existed in 1930's.
Wolf's Bus Lines - served Carlisle, Mechanicsburg.
Williams Valley Transportation Co. - based in Williamstown, served Muir to Harrisburg.