Sentence:  At that point Louis had gone into the dispensary and taken a Tuinal&mdash;what his first med school roommate had called Tooners. “Hop up on the <WSD>Toonerville Trolley</WSD>, Louis,” he'd say, “and I'll put on some Credence.” 
Meaning of the word marked with <WSD> tags:  A noticeably inexpensive trip.