South West Trains and Network Rail have joined together as part of a major scheme to improve services on train networks.
They are the first company where the train operator and Network Rail have formed a joint operation to run the network as a single company.
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The UK drivers' train union ASLEF has offered to suspend next week's strike action. It comes as fresh talks to end the dispute are agreed.
Tuesday afternoon's weather for the east of the region
Tuesday afternoon's weather for the west of the region