I'll be riding Empire Builder (EB) from Montana to Chicago end of February; then connect with Capitol Limited (CL). (I'm aware Amtrak presently not booking same-day Chicago EB connections.) EB's arrival time in Chicago probably won't improve by February enabling same-day connection to CL. Does Amtrak have a consistent metric which says if EB late arrival in Minneapolis - St Paul exceeds a certain number of hours, then CHI passengers get bused to Chicago? Does anyone have insight on this? Thanks in advance.