In September 2014 South West Trains announced plans to procure a total of 30 five-car trains as a means of expanding the fleet used to operate services out of London Waterloo.
The Class 707 is an electric multiple unit being built by Siemens for South West Trains. A total of 150 vehicles will be built, formed into 30 five-car units, and are being built to provide initially for 18,000 additional peak-time passengers into London Waterloo, with a further 6,000 additional passengers capable of being accommodated on completion of associated infrastructure improvements.
The Class 707 units are intended primarily for services between London Waterloo and Windsor & Eton Riverside, allowing the Class 458 trains used on those services to be cascaded back to operations to Reading, which will then allow the Class 450s to move elsewhere.The intention is to run these services as ten-car trains with pairs of Class 707s.
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