Why are there four digit numbers on locomotives?

Why are there four digit numbers on locomotives?

By Cody Grivno | October 7, 2021

| Last updated on March 18, 2026


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Brandon Muir from Canada wonders why locomotives in North America often have four digit numbers, and if the same number would be used in more than one railroad. Cody Grivno, Group Technical Editor, is here to explain.

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