.... It was do it on the cheap or not at all.
The electrification is still highly beneficial to operations and was optimised for the demands that were planned to be placed upon it, you can't just expect a corporation with limited resources to gold plate everything.
Two miles "on the cheap" or one mile "done properly".... I know which one I would take, and it doesn't involve any gold plate.
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Nope, as I understand it the line west of Bournemouth was done in 1988, which mean it was done specifically to use 5WES units rather than the Mark 1 units that had been used on Weymouth services before then. (Well 4REPs to Bournemouth and then 33 hauled TCs to Weymouth).