Additional material has been falling in the Hoosac Tunnel during the past couple of days, causing a larger blockage of the rail route to Boston and other points east.

Pan Am Railways officials say they'll soon have crews working "around the clock" to resolve the issue.

Cynthia Scarano, executive vice president for Pan Am, said the issue was the result of "structural wear and tear inside the tunnel."

Rail traffic through the tunnel was stopped immediately.

Trains have been rerouted to the south through Springfield and the north through Vermont.

The Berkshire Eagle  has all the details.