The Largest Operating Steam Engine in the World Weighs 1
< img src=" https://th-thumbnailer.cdn-si-edu.com/4JNJblQ6Sf88C6Wc5jH0aPWy0sQ=/fit-in/1600x0/filters:focal (958x548:959 x549)/ https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/e5/46/e546a24a-94be-4def-9605-0cef79c7adc6/big_boy_no_4014_on_display_in_philadelphia.jpeg" alt =" "> Built in the 1940s, Big Boy No. 4014 retired in 1961 after traveling for more than one million miles. It’s now making its method across the country in honor of America’s 250th birthday Source
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< img src=" https://th-thumbnailer.cdn-si-edu.com/4JNJblQ6Sf88C6Wc5jH0aPWy0sQ=/fit-in/1600x0/filters:focal (958x548:959 x549)/ https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/e5/46/e546a24a-94be-4def-9605-0cef79c7adc6/big_boy_no_4014_on_display_in_philadelphia.jpeg" alt =" "> Built in the 1940s, Big Boy No. 4014 retired in 1961 after traveling for more than one million miles. It’s now making its method across the country in honor of America’s 250th birthday
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