There are plenty of wonderful things about train travel: the leg room, the scenery, the lack of security pat-downs. The WiFi, on the other hand, has long been the slowest thing about Amtrak. The company announced today that it's finally doing something about its frustratingly sluggish service, upgrading wireless on select trains, including the Acela express between Boston and Washington DC and a few California lines like the Capitol Corridor, Pacific Surfliner and San Joaquin. Travelers to other destinations will have to wait a bit longer for quicker lo