BROOKLYN - Massive train disruptions in the New York City subway system are causing delays for Brooklyn commuters this weekend.Nearly all the trains are experiencing changes because of the Metropolitan Transportation Authority's $11.2 million rebuilding project. The "D," "N," "R" and "G" lines are being affected by the disruptions, as well as the "A," "C," "L" and "F" lines.The MTA suspended service on the "Q" line between Prospect Park and Coney Island-Stillwell Avenue because of station reconstruction work. The train service is being replaced with buses. The MTA says this is the largest shuttle bus operation in the agency's history, with 800 drivers and 600 buses being deployed. The MTA advises all commuters to allow extra travel time to get to their destinations this weekend. MTA