they've no idea where to put the feeder station(s) either.
Haymarket to Dalmeny is just a relatively short add-on to the end of the existing live wires from Waverley-Haymarket-Murrayfield and will be fed from Portobello and/or Currie. At each of these sites the existing feeder station is being enlarged or replaced. The new works at Currie seem to be almost finished and Portobello is reported to be starting.
Portobello, Currie, and Thornton are fully committed, being three of the six feeder stations contracted in 2022. (The others are Ferguslie, Newton and Tweedbank.) Thornton is due to be in place for September 2027. There is more danger of having a feeder station at Thornton with no OLE to feed than of not having a feeder station.
Unless there has been a change of plan from what was announced in 2022, Thornton should feed to Leven (mast foundations in place), Seafield, Lochgelly and Ladybank. Eventually it will no doubt feed further, but plans for a later stage of Fife wiring have not been published.