After receiving complaints from Blue Line riders that platforms were dangerously crowded Monday night and Tuesday morning and commuting times had more than doubled, the CTA is making some service changes to reduce the waiting time between trains, agency spokeswoman Tammy Chase said.

The adjustments include adding more short-run trains, which go only as far west as Oak Park and then turn around, Chase said.

"We think it will help even out the service" until the NTSB allows the accident trains at the Harlem station to be removed and for two-track operations to resume at and near Harlem, she said.

The impact of the accident had "a ripple effect on the entire Blue Line this morning,"’ Chase said. "We are making changes to mitigate that until we can get back to normal service."

"The platforms are packed 10 people deep and the trains are so full no one can get on," Blue Line rider Sheridan Chaney said via email to the Tribune. "My husband left at 7:30 this morning and didn't get to work (Clark and Lake) until 9:15 from the Western stop. I use the California stop and managed to wedge onto the fourth train at about 8:40."

"CTA is making no announcements, of course, and isn't even running express trains to give people a shot at getting on," Chaney said.

Check here for service announcements.

jhilkevitch@tribune.com | Twitter: @jhilkevitch