DutchRailnut wrote:The 11 c plan would close line for long time while old bridge is removed, the 8a plan can be build with current bridge in place and once old bridge id floated out new bridge can be in use next day.
Are all these other choices just a set up to drive the political decision making toward a choice (8A) that the engineers have already made?
It feels like the real estate agent's trick of showing you 3 not-right houses before they show you the one they want you to buy, plus one more (11C) that you can't afford.
I know there are plenty of 100-year old bascules out there, so they must have been optimal somehow (Unlimited height clearance, yes, and something else, like faster-lifting?), but for replacement isn't it vertical-lift every time?