Don't know what their interest is.
Walmart will be pushing the I69 corridor up to Port Huron, MI so they can get their containers out of Houston to Bentonville and points across the fruited plain.
The I-35 corridor is the favorite choice because there already exists the highway corridor and it would only take some expansion of the right of way to add additional lanes. The other proposed routes are not developed, nor is right of way aquired.
I-35 has already had some improvements such as the fiber optic cable tracking system etc. Have you seen the rapid pass scanners on major highways which allow trucks to pass without going through scales and inspection? Same tracking system to be used for containers moving up the gash in America.