After meeting its eastbound counterpart at Dyersville, M337 climbs the hill west of town past a new ethanol plant under construction. IC 6111, IC 6261, CN 9591, IC 9634.
6252 leads M337 down to Riverside Dr. to wait on M338.
An untouched IC 6200 series SD40-2 slowly pulls down main 3 awaiting his Eastbound counter-part, M338. Shot at 19:45.