The Boxcar Dawn — George Martin

Joe Lucas meets some memorable characters, including Delta Slim, Freight Train Lizzie, Irish Mick and Cincinnati Bill, when he hops a Southern Pacific freight train known as The Midnight Ghost. They feel threatened by an unidentified serial killer, whose attacks are apparently random. A violent renegade hippy is the main suspect. Complications develop when the loot from an armored car robbery near the freight yards disappears.