Connections between trains cannot be guaranteed. The nature of the integrated operation of railway passenger services means that to delay one train to await customers from a late-running train arriving at a station may cause significant disruption to many other customers when they make connections at other stations along the route.
Every endeavour is made to minimise the total disruption and particular attention is given to services operating infrequently and the last train services each day.The aim of all Train Companies is to run punctually, but inevitably some disruption occurs from time to time.
When planning a journey you may wish to consider the effects which any disruption could have and to allow some contingency margin when planning connections.