South London commuters are facing delays this morning due to an obstruction on the line.
The obstruction, at Horley, is affected Southern and First Capital Connect services, with delays of up to 45 minutes.
Southern services between Victoria and Brighton are being hit, as are First Capital Connect between London Bridge and Brighton.
The delays are also affecting Gatwick Express and First Great Western services in the area.
It is not clear when services will return to normal.