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Camelback download6/8/2023 They lacked the steaming capacity for extended running, so the constantly back and forth, starting and stopping allowed them to build pressure back up after a quick push or pull. Saddled on 50″ drivers, and producing 20,900 lbs of tractive effort, the A4b’s were ideal as yard switchers. From 1906-1907, they were upgraded with larger tenders with (2) 4 wheel trucks, and they also had their boiler pressure increased to 200 psi, increasing their weight to 108,000 lbs, resulting in a re-classification to A4b. Built original at an A4a, they weighed in at 98,200 lbs, and carried a 4 wheel sloping-back tender. The A4 was an 0-4-0 Mother Hubbard type Camelback built by the Baldwin Locomotive Works in 1901-1903 for the Philadelphia & Reading Railroad.
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