I noted that yesterday’s booklet was designed to go along with the Railroads at Work booklet, but the former never really mentioned the latter. However, this one–which is labeled “vol. 2”–offers a detailed picture-by-picture explanation of 64 of the photos and illustrations in Railroads at Work.

Click image to download a 50.6-MB PDF of this 76-page booklet.

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One of the discussion questions is, “How many different times were used by the railroads of this country before standard time was adopted?” The answer, according to the teacher’s guide, is “about 100.” I don’t know how students were supposed to know the answer to that question since it wasn’t in Railroads at Work.