A perfect example is the infrastructure of US and Canadian railroads. 100 years ago it was the best in the world - today not so much.
3 years ago I took a high-speed train from Beijing to Shenzhen that took 8 hours overnight - that was 1,500 miles or roughly Boston to Miami.
2 years ago I took a train to Paris from London and returned the same day............... it was wonderful.
As
@BMC will attest Amtrak is hampered by the State of Connecticut that doesn't feel that upgrading the track between New Haven and Greenwich is worth the investment and trains can not go faster than 59 mph.
In Canada, Montreal/Toronto could be a trip a little over 2 hours as the track in a straight shot but too many grade crossings.