The Chicago Transit Authority has been plagued by a series of fires over the last year, including a massive blaze at a transit hub last November that killed at least 12 people.
Now, engineers have been discussing how to get to the bottom of the problem.
The agency has hired CTA Engine Parts Corp. to investigate the problem, according to the Tribune.
It also announced plans to hire a company to help identify the culprits.
The company, CTAEngine Parts, was created by CTA President and CEO Thomas R. Garvey and will be responsible for identifying the problem and developing plans for dealing with it.
The CTA, the union representing CTA employees, has filed a complaint with the Federal Trade Commission.
The CTA has been working to make the fireproof and fire-proof stations available.
It will take some time before the stations are installed, but they are scheduled to be up and running in late September.