Re: When did PCB tracks become 'traces'?
"Railroad" was the term used by George Stepenson and was taken to America with the early railway equipment, along with other then-current English terms such as "engineer", and "cross-tie" for "sleeper". There was a transition period where both "railway" and "railroad" were used on both sides of the pond. Some US lines still use "railway", and mail by train was always called the "Railway Post Office".
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