"All Santa Fe high-speed transcontinental lines have been designated as 131-132-pound rail territory. That means that much of that mileage and all new rail laid in that territory is 131-132-pound rail except in . yards and other localities where lighter rail is preferable. The new standard 115-pound section will shortly replace the present 112-pound. Other rail weights in use by the Santa Fe are 60, 75, ยท 90, 110 and 112-pound. The three last-mentioned sections were standard on Santa Fe main lines for many years and considerable presentday Santa Fe rail mileage consists of those weights of rail. All Santa Fe rails are steel and have been for many years. Beginning with 1936 all rails have been control cooled by the manufacturers to eliminate as far as possible interior defects in the head of the rail." - Santa Fe Today, #5. pg. 22
https://www.railsandtrails.com...Today%20No.%205r.pdf
So 155# isn't too far off for ATSF mainline as they upgraded their 75#, 90# and 112# mains to 132# or 115#. I'm guessing Argentine to Topeka (IE: Lawrence) was probably upgraded to 132# as it was on the Chief route - so that's not a huge disparity.
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