I’m usually a huge Amtrak fan. But not today. Sure, I love to zip along to Boston at 145 mph on Acela, enjoy a land cruise through the western scenery on “The Southwest Chief” or even poke along for 27 hours from Chicago to New York on “The Cardinal.” If you’re a rail fan, what choice do you have but to take Amtrak? But Amtrak is also responsible for running commuter trains, including two lines in Connecticut. And here they have been failing spectacularly.