Gross exaggeration.
212m. horizontal from Platform 12 to the roundabout
http://wikimapia.org/#lang=en&lat=53.089462&lon=-2.434931&z=16&m=b
Assuming that the lower and upper tracks are not directly over each other you need only twice the worst case GC vertical gauge clearance. Which is twice 5.1m..
http://www.bathnes.gov.uk/sites/def...ng/nr_a_guide_to_overhead_electrification.pdf
212/5.1+5.1 == 1 in 20.8
Throw in even a small sprinkling of engineering ingenuity and a workable roadway is easily achieved. The benefits are huge.
You people are such defeatists!
Sorry, was imagining the ramp from the roundabout up to clear the approach to platform 1.
I would argue about the height though. The "Workable roadway" has to allow for the modern high lorries, and the thickness of two decks(one for the road to replace the existing, and another for the rail above that) will take at least another metre.
Anyway, shoving walls of impenetrable infrastructure through existing towns has been found to be a bad idea, especially if they blight their surroundings.
Simpler to go for an Antwerp-type solution (if it needs doing at all...)