Both quoted figures refer to ton-miles. And according to those figures BNSF has a market share of 702m / 1.85t = <0.1%. But it is the number 1 railroad in terms of market share. What am I missing?
BNSF's market share is much much higher in ton miles than it is in revenues, if that is what you are getting at -
"In that respect, we are a strong number one among the seven large American railroads (two of which are Canadian-based), carrying 45% more ton-miles of freight than our closest competitor."