Does anyone know if the Dalmeny electrification will include the loops? If it does, then it provides some flexibility for electric trains from the east to run through Haymarket and serve South Gyle and/or Edinburgh Gateway. The
0718 from North Berwick runs to Haymarket, with a return at
1740. Both of these require an ECS reversal at Haymarket Central (
morning,
evening) which I imagine will be awkward to timetable at peak time. With the loops wired up, you can extend this service by a stop or two and get it out of the way until there's a clear return path. It won't be transformative, but more flexibility is always better.