people waiting for trainREUTERS/Gonzalo Fuentes 
Congress' inaction is looking even more disruptive.
Union Pacific CEO Lance Fritz said Thursday that if Congress doesn't pass an extension to a bill aimed at rail safety, then hundreds of thousands of travelers would no longer be able to use the train.
"We said as we approached the end of the year, we would start working with our Amtrak as well as the commuter agencies that we host to stop passenger traffic," said Fritz in a quarterly earnings call. "Both of them would be very bad for the US economy and for commuters."
Union Pacific has rails running from the West Coast all the way east to Louisiana in the South and Illinois in the North.
This shutdown would be even worse for Chicagoans, since Union Pacific runs a number of lines for the city's commuter rail system.
"You can imagine in a place like Chicago, if the commuter lines were to stop running January 1, what commutes would be like for the 300,000 people a day that rely on those commuter lines," said Fritz.
This is the second rail executive to bring up the issue in the past two days, including allusions to Chicago. Keith Creel, chief operating officer of Canadian Pacific Railways, said that his company would have to cut off shipments in the US that could affect Chicago's drinking water.
The congressional act in question is the extension of a bill that requires rail companies to install a system called Positive Train Control, which would help prevent collisions and derailments.
When the bill was originally passed in 2008, the rail companies were given until December 31, 2015, to complete them. Now, Union Pacific and Canadian Pacific said they will not be done in time despite making headway on PTC.
union pacific lance fritzCNBC/YoutubeUnion Pacific CEO Lance Fritz.
Fritz said that despite the tie-up on Capitol Hill, he thinks the extension is coming but that the effects of not doing so are coming quick.
"I'm very optimistic that Congress will be prudent and, well, has an extension before we have to take any action," said Fritz. "But what we've said is around Thanksgiving, in order to remove [toxic-inhalation hazard chemicals] from our railroad, we would have to start imposing an embargo."
Part of the reason the bill was passed was to protect against spills of dangerous chemicals that are dangerous when breathed in.
Part of the reason for the slowdown, despite the fact that it was introduced September 30, is that Democrats have attached the extension to the passage of the highway trust fund, which is just as divisive an issue.
Now, not only is Chicago's water in jeopardy, but its transportation is as well.