T&P Transcon Division

I am trying to verify the date that passenger service was discontinued over the TC division. T&P trains 31-32 were discontinued between Texarkana, New Boston, and Fort Worth sometime in the last half of 1950, but I need a more accurate date.

Also, when was the last through freight service on this line, and in what years were the different track segments abandoned?

Thanks,

Bill Pollard