 
			
			The delay to electrifying four Great Western lines could affect planned service improvements on routes not scheduled for electrification, with diesel multiple units (DMUs) remaining in the Thames Valley for longer than expected, writes Rhodri Clark.
Great Western Railway and the DfT aim to replace the Class 165/166 Turbo DMUs with electric multiple units (EMUs) on Thames Valley workings into Paddington. The DMUs would be redeployed on the inter-urban route between Cardiff and Portsmouth via...
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