Don't agree at all, a section of short single track at the middle of the n-s line more or less can absolutely be worked around - if we have the desire to make it work. Platforms have been pretty close to done at Milliken and Agincourt and Kennedy for quite some time. We need to get used to operating higher frequency on less track. The line on the East shore of Lake Zurich is still single tracked in places and handles a ton of tph, even local AND express!Not without the West Highland Creek bridge and the stations, it couldn't.
The work was oddly sequenced, since the track contract was placed first and is largely complete - but without the platforms being ready at Milliken and Agincourt, and the bridgework at West Highland Creek, all that new track and sound walls and grading have not led to any new capacity.....yet.