Railway bridges are an important transportation infrastructure in meeting human needs. Along with the increasing age of a structure, the railroad bridge will also experience a decrease in capacity caused by internal and external factors. Seeing the use of a railroad bridge that is very important, strong structure and able to guarantee safety and security are needed. Reinforcement is an effort to restore the load capacity of a structure that it can withstand the burden that occurs. In this research the warren type steel frame railroad bridge experienced a decline in steel quality by 30%. Analysis and modeling of steel frame structure using SAP2000 V.20 software which was then reinforced by replacing weak elements in the steel frame structure. The results showed that the maximum of mode shapes after reinforcement in the directions of UX has a worth of 0.072% greater than before reinforcement from 0,825365 to 0,825962 and the period value (T) also increased by 1.603% from 0,370023 seconds to 0.375957 seconds. The maximum deflection that is occurs shown in the direction of U3 joint 18 displacement after reinforcement has decreased by 32.85% from 36.437377 mm to 24.467447 mm. At stress evaluation, there are 25 rods that experience field capacity, which is then reinforced by replacing 17 rods by enlarging the profile dimensions so that the entire stem does not experience field capacity. The maximum resistance value on the unsafe rod after the reinforcement is smaller than 25,324 tons to 23,861 tons with an increased capacity from 12,612 tons to 34,824 tons.