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One of the great articulated locomotives from the 20th Century. A truly great American accomplishment. So long they had to be hinged in the middle. Two complete separate engines/boilers in one locomotive. Some were compounded - used the steam more than once. The Baldwin Big Boy won a prestigious mechanical engineering award for design and complexity. I got to see one pulling the Cajon grade about 12 years ago - a sight to see (and hear)!!!