had8ley, You got to remember that the MKT was always very marginal financially. I think the takeover of the CRIP track was more of the state of Oklahoma begging them, "please take it so it does not get abandoned" than anything else. The MKT did not spend much money on the CRIP track because they did not have it. 35 million probably went to run trains. It would have been near to the effect of a gallon of water on a forest fire to put it into the track.
In 1986 I went with a group from DART in Dallas up to the MKT rail welding plant in Dennison. They were welding up well worn 112 lb rail that had been rolled in 1943. The oldest welding of second hand rail that I ever saw in the flesh. Two things here: 1. their traffic density was such that 40 year old rail was not really that badly worn 2. their need for rail was such that they were willing to crop, weld up, and put in track a rail section that had turned out to not be that good to begin with. (Almost as old: I also saw some 131 lb welded rail with 1946 rolling dates in the CSX line near Pensacola. It replaced 100 lb jointed rail rolled in the 1920's. Older, but I did not see it: The CRIP track charts showed 90 lb welded rail in some parts of the branch line from Little Rock to Alexandria LA: rolling dates in the teens, put in track in about 1970.)