New infrastructure will increase capacity allowing for the operation of four trains per hour in each direction.
The planned work will include the reinstatement of the second line between Swindon and Kemble, upgrade to earthworks along the route to accommodate this new track and new signalling equipment.
This capability will be essential during the planned electrification of the Great Western main line when Bristol Parkway and Severn Tunnel are closed and south Wales trains are diverted along this route over the future years.
Network Rail western route managing director Patrick Hallgate said: “Initial work has already started and during these operations where possible the railway will remain open.
“The line of route between Swindon to Kemble was double track up until the late 1960s, when a decline in passenger demand led to the singling of the line. Over the intervening years passenger demand has grown significantly and this scheme will meet the demand forecast over the next 30 years.
“The project has been programmed to open at Easter 2014 to coincide with a major signalling renewal - which will see the Swindon controls relocated to the Thames Valley signalling control centre in Didcot and this has allowed us to minimise the disruption to passengers.”
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