character: The Hammer
topic: Tools in Railroads
grade: 4
subject: Reading
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character: The Spikes
topic: Fastening Techniques
grade: 4
subject: Reading
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character: The Rail
topic: Structure of Railroads
grade: 4
subject: Reading
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character: The Liner
topic: Techniques in Leveling Tracks
grade: 4
subject: Reading
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