It happened around 5:30 p.m. at East 16th Street and Newkirk Avenue.
As a result, the B and Q trains are running on the M Line between Stillwell and Dekalb Avenues.
Also, select downtown Q trains are terminating at the Prospect Park Station.
In addition, due to ongoing switch problems at the 34th Street-Herald Square Station, downtown N and Q trains are running on the local track between the 57th Street-7th Avenue Station and the Prince Street Station.
Please expect delays on the N, Q and R trains at this time.
For more information please visit: http://www.mta.info