There is another shut down of the West Anglia Main Line north of Broxbourne this weekend and whilst trying to plan a journey I've noticed a rather strange quirk in the amended timetable. Normally on a Saturday, Enfield Lock would see 3 trains an hour in each direction - 2 x Liv St to Hertford E and 1 x Stratford to B Stortford. It's understandable that there is a reduction to 2 trains an hour during these engineering works, however it appears that Brimsdown is seeing 4 trains an hour which is twice as many as usual. Is this an error in the timetable or is there a reason that Brimsdown gets twice as many trains an hour during these works while most other stations see a reduction in services?