I really hope that the extra time that is being taken to build the Valley Line will include extra testing to ensure everything is working well for opening day. The last thing we need is another Metro Line disaster or what Ottawa is experiencing.
I think TransEd has been quite careful. Concrete rail beds have been built on much of the track. With the concrete block, removing it would have caused a sinkhole, why the workaround was done on the Tawatina Bridge.