The bay window caboose is believed to have first been used on the Akron, Canton and Youngstown Railroad in 1923, but is usually associated with the Baltimore and Ohio Railroad. Since the crew monitoring the train sit in the middle of the car, this design permitted a better view of the side of the train and eliminated the falling hazard of the cupola. The windows, which project from the side walls of the caboose, resemble architectural bay windows - thus the name bay window caboose.
Lionel's version of the bay window caboose is scale-like and closely resembles the real life counterpart. All Lionel bay window cabooses had illuminated interiors, detailed end railings, dual functional couplers and cushioned passenger style trucks and thus afforded comfort to the imaginary crew.
During the postwar years, Lionel built only one model of the bay window caboose, the 6517. It is an excellent model of a real life bay window caboose and to this day remains popular with both collectors and operators.
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