I found two post cards of the Reader Railroad recently. Here’s a link: Reader Railroad
It’s really annoying. I thought I had a handle on the dating of these cards, but, when I told a colleague about it, I realized that I had been totally wrong. The cards were printed by Koppel Kolor (or Color) Cards in Hawthorne, New Jersey. The company’s main building appears to have burned down in the mid 80s.
Update on the dating for these cards: mid-1960s. See comment below courtesy of thedigitalphilatelist