Red and Blue Meet. Summertime is the best time to shoot down Park Avenue from the MTA Metro-North Railroad, 125-Harlem, New York, New York and get those shots with Grand Central Terminal in the background. A rebuilt set of M3s headed north passes rebuilt M2s that are GCT bound on August 9, 2011. While the M2s are long gone from the railroad, the M3s soldier on with no planned replacement in sight.