Secondly, the connection between the IAIS mainline and the CRANDIC line (former Milwaukee line) near Homestead was rebuilt to have an eastern leg, forming a wye. Placed into service 11-Feb-2000, this formerly seldom-used junction was re-christened Yocum Connection, in honor of Fred Yocum, a former president of IAIS. This is now the major interchange point between IAIS and the CRANDIC, eliminating most of the need for the hill track in Iowa City. It also worked out well for the new ICCR/CRIC trains, which can run straight through the junction without any sort of runaround to get lined up.

Today's operations on the Third Sub include the two mainline trains - CBBI and BICB - as well as daily sets of ICCR/CRIC interchange trains. CBBI generally starts the day in Newton, switching and preparing for the run east. Somewhere in the late morning, it departs Newton eastbound. On the other end of the sub, RIIC (Rock Island - Iowa City, off the First Sub) is the first into Iowa City in the mornings. It switches out what it needs to and proceeds west as ICCR (Iowa City - Cedar Rapids) sometime around 1000h-1200h. Behind it, BICB typically arrives in Iowa City around noon (though this varies significantly). ICCR proceeds west, turning north onto the Crandic line at Yocum Connection, often meeting the eastbound CBBI there. By this time, BICB is usually done at Iowa City, and either holds for CBBI in the yard, or proceeds west and meets BICB somewhere en route. CBBI pulls into Iowa City and works the yard in the mid to late afternoon, and BICB pulls into Newton in the late afternoon or evening. Meanwhile, once ICCR completes its work at the Cedar Rapids interchange, it works back down to Yocum and heads back east into Iowa City, where it comes in usually after the CBBI has completed its work and departed east. Thrown into this mix are also the Newton Switcher that works industries in and around Newton, and the Iowa City switcher, which runs pretty much anywhere between Marengo and Wilton.