Entry - British nationals can enter Colombia for 90 days for tourism purposes without a visa. (holidayextras.co.uk)
Americans other than Cuban - Americans would not be allowed to travel on their own for general tourism purposes, but only with organized educational and other groups on pre-set itineraries. (businessinsider.com)
Now many heritage railways exist solely for tourism purposes after the infamous Beeching Cuts of 1963. (raildiscoveries.com)