A question that somehow hasn't come up yet directly in this thread (though referred to indirectly) is why the Euston station is so problematic. I think these are a significant part of the problem:
- repeated redesigns: Design work is expensive. Repeatedly binning designs and starting over inflates cost and causes delays. I think we're currently at the third redesign?
- conflicting demands meaning no design meets all the requirements set (for example, the whole "there will be oversite development to recoup costs" and "there will not be enough budget for foundations to support oversite development" saga)
- The inherent costs of building in central london
Personally, I think the solution is at least in part to drop some of the requirements, preferably in such a way that one of the existing designs meets all remaining requirements
Out of interest, do you have any examples to hand?
Utrecht centraal similarly has platform canopies at the busiest station in the Netherlands. A Utrecht Centraal-type station would actually be really good here I think:
- concourse along the middle of the platforms for easy access in both directions, designed for high throughput of people
- platforms long enough for 2 trains (for any trains that are 200m long, having sufficient length that both could be open for boarding at the same time prevents crowding of the concourse)
-attractive and affordable platform canopies
-lots of natural light