It's supposed to start in the spring, but thats always subject to change. I'm only guessing, but this project will be easily 18 month 2yr project. 6 miles to fill in the gap with a lot more work to be done than the current project.
Railroad Forums
MetraBNSF wrote: ↑Thu Nov 14, 2019 8:16 am From what I’ve read a majority of the third track between Geneva and West Chicago will be laid to the south of the current main with the exception of a small stretch around the area of IL 25. That’s the bridge that’ll be closed for a few months so it can be modified to carry three tracks.I didn't think they were closing the bridge down. The piers and supports already can accommodate a third and fourth deck.
I’ve also read that parking south of the tracks at the Geneva station will be removed (hence the addition at the parking deck built a bunch of years ago. I wonder how the south platform will be handled.