Back in the day the travel time was 3 hours even to go 117.2 miles with 11 stops between OKC and Tulsa that was an average speed of 30 MPH (with time stops included). (Link 1)
The Eastern Flyer travel time between Sapulpa and Midwest city was supposed to be 2 hours and 50 minutes without any upgrades to the tract (Speed limit of 40-45 mph) and that was with 4 stops in between (comes out to an average of 34.4 mph with the stop time included). Tack on probably 10 more minutes to OKC and 10-20 more to Tulsa if access to the BNSF/UP lines was granted. (Link 2)
The plan was to realign a few sections, add signals and a few other upgrades that would bring the Sooner Sub up to Class III which would've allowed speeds up to 60 MPH and the cost on that was only $2.35 million.(Link 3) According to ODOT and WATCO, those upgrades were made in 2016 and passenger train speeds of 60 MPH are now possible(Link 4)
If they were able to spend $2.35 Million to upgrade from 40-60 mph, then conceivably it should be possible and not overly cost prohibitive (especially compared to laying 100-120 miles of new track) to get it up to turnpike speeds (70-80 mph) which has been the opinion of OK rail advocates who are way more knowledgeable on it than I am (Link 5).
All of that to say, if conventional rail is all that's on the table, it would make a ton more sense to do it along the current line. The class III upgrade should make it significantly faster than the 3+ hour trip that was initially proposed (it should be somewhere between just under 2 hours and 2 hours, 20 minutes) and express trains and/or additional track upgrades would make it faster. I also don't think it makes sense to completely bypass every town between the two city centers if it's just conventional rail and infrastructure is already in place. Now if they were going to go for high speed rail eventually, laying new straight track along the turnpike with a few stops on the line would be a better plan but for standard conventional rail, the cost of using the current track and ROW and upgrading where necessary wouldn't be in the same stratosphere as adding a new line along I-44, would accomplish the same thing and likely serve more people between the two cities. No point in hunting deer with a howitzer.
1.
https://www.facebook.com/photo/?fbid...28514310520985
2.
https://www.facebook.com/photo?fbid=...60219357350533
3.
http://chrome-extension://efaidnbmnn...H4W0QYlBZDxeds
4.
https://www.facebook.com/friendsofpa...FvLzjdpw831zPl
5.
https://www.kjrh.com/news/local-news...-tulsa-and-okc
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