The Ojinaga-Chihuahua City highway runs through relatively flat country, and upgrading the "Super 2" to an Interstate standard highway would not be too difficult. However, building the needed highway tunnels through the Sierra Madre mountains would be extremely costly. The Eisenhower tunnels on I-70 west of Denver, 1.6 miles long, cost over $300 million in 1960s - early 1970s dollars, and would probably require about $2 billion today. Proposed improvements to I-70 in the vicinity of Vail, Colorado, to relieve chronic congestion, run anywhere from $2.5 to over $8 billion, depending on whether passenger rail service is included.
It is hard to see how either the public or private sectors, or a combination of the two, would construct the necessary highway and rail service to create a major freight connection between the Pacific coast of Mexico and Texas.
Thanks for the info. Like you say it maybe too expensive to ever construct. But I know that some are trying to find ways to bring the Pacific imports via other ports besides CA. Walmart has now set up operations via the Port of Houston to bring in about 28% of their container imports via the Panama Canal. I think the Chinese are looking for other venues as well..... It appears the far east is going to be a major supplier of goods to this hemisphere so no telling the scope it will take in the long run.
Take care