From the UK, LNER Flying Scotsman toured the US in 1969 and 1970, LMS Duchess of Hamilton was the Baltimore and Ohio in 1939 from Baltimore to Washington around the same time as the World's fair, and GNR 11247 (LNER J52) was at Railfair 1991 at Sacramento (I am also planning on doing a video on this locomotive on youtube). There was also a variety of international/European locomotives at the 1939 World's Fair in New York, such as an Italian ETR 200 and British reefer car (https://www.1939nyworldsfair.com/worlds ... _day_1.htm
Now there used to be a heritage railroad in northern Michigan known as the Boyne City Railroad, which used a British 0-6-0 tank engine, Flying Duchess, with two British Rail Mark 1 coaches (http://www.railroadmichigan.com/boynecity.html
). The coaches are on static display in Standish, MI, and the engine is preserved and repainted in Lagrange, KY, close to the virtual railfan camera, but cannot be seen from there.
Lastly, Ottawa's O-Train uses Bombardier Talent multiple units for their service, Ontario Northern used to have RAm/DE train sets from the Trans Europ Express from the Netherlands and Switzerland, and finally the Train de Charlevoix uses thre DB class 628.1s from Germany which are still in use.
"Look down, step over, and watch the gap!" - Dr. John Clarke, The Gap Rap (2010)