Sentence:  The proposed Bedford-Leeds service requires the <WSD>electrification</WSD> of the Midland main line north of Market Harborough (it assumes that Kettering to Market Harborough is a done deal) and the Birmingham-Nottingham service requires <WSD>electrification</WSD> west of Nottingham. 
Meaning of the word marked with <WSD> tags:  The adaptation (of a home, farm, village, city, industry, railroad) for electric power.