Said to occur when two black tokens are placed simultaneously at Morden?
, usually as a result of player-shunts around the Circle Line. Players cannot enter Morden until the black tokens are removed, and given that it is a Northern Line terminus this means that in most cases the block can only be removed by entering Morden and dropping white tokens.
A Morden Paradox usually blocks the station for the entire game, although careful token shunting from South Wimbledon can cancel it.
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