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10 January 2011, 15:07 | Updated: 10 January 2011, 15:09
Tube drivers are threatening to strike on April 29th, the day of the Royal wedding.
It's part of part of the same row over bank holiday pay which led to disruption on the underground on Boxing Day.
But the union's general secretary says it's not been discussed fully yet.
A million people are expected in Central London to watch Prince William marry Kate Middleton.
It comes as the RMT union's announced its members will strike on the Bakerloo and Northern lines for 24 hours from Friday night.
It's a separate row involving the sacking of 2 drivers.