Soviet Young Pioneers ride aboard a locomotive built in part with scrap metal they collected, 1963, USSR -- Daily LIFT #541
From the photo caption: "These proud Pioneers collected the scrap metal used in making the diesel locomotive shown at the Bryansk Machine Building Plant. The inscription "Made from scrap metal collected by Young Pioneers" can often be seen on other kinds of machines, such as combines, tractors and cranes."
To learn more about the Soviet Pioneers see: Artek: The vast Soviet internationalist complex of children's camps (theleftchapter.com)
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