The Hertford East branch line, and Lea Valley lines, are both in which country? 
Hertford East branch line: The Hertford East branch line is a railway line in Hertfordshire in the United Kingdom, running between Hertford and Broxbourne . Lea Valley lines: The Lea Valley lines are two commuter lines and two branches in North East London, so named because they run along the Lower Lea Valley of the River Lea.
United Kingdom