Weekend Rails: No 3 Trains Between Chambers and New Lots Ave.

Going somewhere? Here's the breakdown of this weekend's transit trouble spots:

• There will be no 3 trains between Chambers St. and New Lots Av. 2 trains and free shuttle buses will provide alternate service.

• There will be no 4 trains between Franklin Av. and New Lots Av. Free shuttle buses will provide alternate service.
• Inwood-bound A trains will skip Rockaway Av. and Ralph Av.
• 168 St.-bound C trains skip Rockaway Av. and Ralph Av.
• Chambers St.-bound J trains run express from Broadway Junction to Marcy Av.
• Coney Island-bound N trains run over the Manhattan Bridge from Canal St. to DeKalb Av.
• Coney Island-bound Q trains run express from Prospect Park to Sheepshead Bay.
• Bay Ridge-bound R trains run over the Manhattan Bridge from Canal St. to DeKalb Av.