> It seems that nobody expected the software and signalling to take an additional 4 years of time. Somebody somewhere really messed up that part of the project.

> It seems that nobody expected the software and signalling to take an additional 4 years of time. Somebody somewhere really messed up that part of the project. Everything else - the main civil engineering project - did go extremely smoothly and was even ahead of schedule at times. I understand software and signaling took extra time, but those drove the costs too? Compared to the rest, they don't seem expensive.