Passengers on South Western Railway services face a third day of disruption this week because of strike action.
Members of the RMT Union have been walking out because of a disagreement over the role of guards on trains.
The company is refusing to guarantee a second member of staff on every train and there are currently no plans for any peace talks.
The industrial action is creating knock-on delays from Berkshire and Basingstoke in and out of Waterloo.
Guards in the RMT also stopped work on Monday and Wednesday - where around 1 in 3 services were cancelled on each of these day.
The Department for Transport has denied that the dispute is about safety.