For a moment, let's set up a pseudo scenario between the two railroads listed in my above marquis. And suppose that 'you' work downtown in Chicago but live in Naperville. Let's also assume that it is 20 degrees below zero outdoors and Chicago is having a two foot snow blizzard. This is a rare Chicago situation but it has happened in the past.
So your boss lets everyone go home early. Your usual method of traveling home to Naperville is the Burlington Northern railroad. However, when you arrive at Union Station in downtown Chicago, you are informed that the electroinic track switches are frozen in La Grange, Illinois. Therefore the Burlington Northern line is at a complete shut down / stand still. So what next?
In downtown Chicago, the Burlington Northern in the Union Station is only four blocks from the Union Pacific in the Olgivie Station. And so you inform your wife of the Burlington Northern problem - - and then you walk to the nearby Olgivie Station. There, you purchase a ticket on the Union Pacific "West Line" for your goal of Wheaton.
At Wheaton, you disembark and your wife is waiting for you there (at either Wheaton station) - - for your drive home to Naperville.
It is still true that the winter storm conditions are fierce. But in arriving at Wheaton via the railroad, the driving distance to you home in Naperville is only seven miles. And that is far better than staying at a Chicago hotel that could cost $200 per night.
Carter Glass,
Wheaton, IL