Despite the repair of dozens of miles of track, more Chicago Transit Authority trains are operating at lower speeds over more track.
According to CTA officials, about 19 miles of track are under go-slow orders. That's an increase from 15 miles in December.
The agency operates 224 miles of track.
Efforts to replace rotted rail ties and rusty tracks reduced slow zones from 23 percent of total trackage in October 2007 to 7
percent in December 2008. Since then, slow zones have crept up to more than 8 percent this year.
CTA officials say money is not available for additional work. They add if state and federal capital funding is not approved soon, the number of slow zones will inevitably increase.