The Crewe and Chester line is, I think, one of those built by Thomas Brassey. Of the approximately 40 overbridges, I think most are his originals, still in good condition and visually attractive, and they give the line much of its character. Whether they are listed, I don't know. But I think they may not be easy to lower the track under. The arches could be replaced, 1960s style, by concrete middle sections but again that would significantly alter the character of the line. Christleton Tunnel could also be a challenge. I hope that a way can be found of erecting continuous knitting and preserving the character of the line.
Current traffic levels, both between Crewe and Chester and on to Holyhead / Llandudno may make electrification hard to justify on hitherto applied criteria, but I hope we can all be more generous about it and splash out. I agree that electrification should also include the line to Warrington and hopefully also the CLC route from Mickle Trafford to Stockport. It will be important to keep all the lengths of double track and not do any singling.