Question: What company built a railway line that runs along the boundary between Hertfordshire and Essex for much of its length?
Sentence (from "West Anglia Main Line"): It runs generally north through Cheshunt, Broxbourne, Harlow, Bishop's Stortford and (near Saffron Walden) to Cambridge, with branches serving Stratford, Hertford and Stansted Airport.
Relevant evidence: No