Originally Posted by JOUY31

Irregular, small in scope SNCF strikes that target some suburban lines. When they impact RER line B, the interconnection at Gare du Nord between the Northern part, operated by SNCF, and the Southern part, operated by RATP, is suspended. Trains arriving from the North then arrive at the main part of Gare du Nord, on street level, rather than at the underground station, where the tracks go on South on the RATP network.