Attention there, Loop commuters. As of 3:51pm this afternoon, the CTA is alerting customers to a rather sticky problem with the northbound Red Line at the Jackson station which is rippling north. Northbound Red Line trains are (as of this posting) being rerouted onto the elevated structure between Roosevelt and Fullerton, with no additional shuttles running. The current Loop stops are as follows: Roosevelt, all stations along Wabash and Lake, Merchandise Mart, then trains will run express to Fullerton to resume regular northbound routing to Howard. Southbound Red Line service is not affected. [UPDATE: As of 5:24pm, Red Line Northbound service is running normally, but still expect some delays.]