BALITMORE, MD – APRIL 15: B O No. 908, John T. Collinson Baltimore Ohio Railroad on April 15, 2017 - Kelleher Photography Store
BALITMORE, MD – APRIL 15: B O No. 908, John T. Collinson Baltimore Ohio Railroad on April 15, 2017

In 1917, the Chicago Alton Railroad built an all-wood office car known as the No. 503. In 1926, the No. 503 was rebuilt and given a steel under frame and riveted steel body.

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