UP 4101 & UP 1139 with 29 cars in tow descend Cuesta Pass near the second horseshoe at Serrano

UP 4101 & UP 1139 with 29 cars in tow descend Cuesta Pass at CP S. Serrano

Near Serrano on Cuesta's second lesser known horseshoe, UP 4101 descends the 2% grade with 29 cars in tow