The Metropolitan Transportation Authority said Sunday that it was adding an automatic safety braking system on the curve where a Metro-North commuter train derailed in the Bronx, killing four people, according to NBC News. The authority, which controls public transportation in New York, said it planned to install several new protections, including a signal system that will warn the engineer to slow the train and automatically do so if the engineer fails to in spots where there is a dramatic speed change. The Dec. 1 accident happened on a sharp curve in the Bronx where the speed limit switches from 70 mph to 30 mph. The train was going 82 mph as it approached the Spuyten Duyvil station, officials said. The new system will be fully operational Monday.