Let me rephrase that. Unavoidable Summit loop I'm afraid. Winning move Dollis Hill Summit but has to be played subsequent to penultimate station, Llanberis. Welshcakes make an excellent subsitute for podumes.

Did this work?

I know its tacky, but how about the Blaenau FFestiniog game? You obviously need to be careful at Minffordd to avoid a Portmeirion plasma flux, but is anyone brave enough? And don't be fooled by the apparently simplistic linear nature of the line. ahem Porthmadog!

Well, Tan-Y-Bwlch seems to be a safe move at this point.