We do not have trains scheduled to berth at London Waterloo for the whole of the period between the morning and evening peaks. However, there are occasions when we have to berth trains for periods of up to an hour and sometimes longer; the main reason is that a number of inward services split on arrival to form two outgoing services. Other reasons are that a train may require the attention of our maintenance staff, there may be infrastructure problems causing trains to be diverted to other platforms, or it may be waiting to join another train.
Richard Davies, Company Performance Manager