Very interesting article on the front page of today's Washington Post. The Port of Baltimore is in danger of losing revenue because the Howard Street Tunnel can't handle the height of double-stacked container train cars that will be used because of the new mega-sized container ships soon to call at the Port. The Tunnel, which was built by the B&O in the 19th century, runs for 1.7 miles under city streets and is needed to move container traffic from the Port to inland locations. The article mentions a possible work-around currently being studied.
Here's the link. Fair warning: The Post website frequently asks you to register your email to read articles. It's free. I read it every day and have never received advertising or spam email from them.
http://www.washingtonpost.com/...IQAjYCVhS_story.html