Simplify the following text for a Grade 7 native English-speaking person.
Original: The station opened on 15 September 1840 as Tottenham , on the Northern & Eastern Railway ( N&ER ) line from in east London to in Hertfordshire .
Simplified: The station opened on 15 September 1840 as Tottenham . It was on the Northern & Eastern Railway ( N&ER ) line from Stratford in east London to Broxbourne in Hertfordshire .