In Aug 2004, it changed again, from an important interchange point to a fundamental part of IAIS operations on the IAIS Third Sub. As part of an experimental six month trial expected to become permanent, the CRANDIC no longer operates the through freights on this line. Rather, daily interchange with the IAIS is accomplished at Smith-Dows yard, with IAIS running the ICCR / CRIC (Iowa City-Cedar Rapids and reverse) turn out of Iowa City every morning. This train is typically made up between 1000h and 1200h at Iowa City and then works up to Smith-Dows. It switches out the freight, and sometime in the late afternoon returns to Iowa City. It makes for a very regular, easy to follow daylight train. This train is also the reason the IAIS acquired the four leased LLPX SD38-2s. The line from East Amana to Walford is quite steep against northbounds, and the ICCR trains typically run very heavy (100 cars is not atypical).
In addition to the daily ICCR/CRIC turn, there are also coal trains and unit grain trains that ply the line off IAIS. The coal trains originate on the Canadian National, and are handed off to IAIS at Peoria on the IAIS's Second Sub. These then make their way over the IAIS First and IAIS Third Subs, head up the CIC's Third Sub, unload, and head back to the Peoria gateway. Often, the run back from Cedar Rapids is handled combined with the day's CRIC job, leading to a monsterous train and an incredible amount of power on the front (the coal train power is combined with the ICCR power for the run). The grain trains come in from the west of Yocum (Newton, typically), and are sometimes handed off to the ICCR at the Yocum wye. The CIC's Third Sub is a vital and active part of today's IAIS that's easy to railfan in the daylight, unlike many other parts of the system that operate primarily at night.