main trusses up to . He also applied the theory of influence lines for truss analysis that enabled a more accurate calculation of internal forces in every member in a truss due moving loads on bridge structures. Since then, the theory of influence lines for truss analysis has been used in engineering both in Russia and around the world. Incidentally, the Yenisei bridge was the first in Russia, during the construction of which the incremental launching method was applied for the first time. Thanks to its engineering and technical characteristics, the bridge was recognized as the longest in Russia and the second largest in Europe (the first one was in the Netherlands across the Lek River near Kuilenburg). Represented at the Exposition Universelle (1900), the Yenisei bridge's model received the Gold medal, while Proskouriakov himself went on to become one of the country's most prominent engineers. The bridge was subsequently approved by the UNESCO for inclusion in the World Heritage List. The Yenisei bridge was ground-breaking for its time. Proskouriakov's statically determinate trusses with subdivided panels and upward-angled upper chords were subsequently widely used by many other bridge engineers. For example, such a system (with a few changeups) was borrowed by Prof. Nikolai Belelubsky in the design of the rail bridge across the Volga River near Sviyazhsk. Proskouriakov managed to elaborate the most suitable types of spans for a variety of bridges. He designed many unique multi-span bridges, including the bridges over Oka near Kashira (1897), Belev (1897) and Murom (1912), Vyatka on the Cherepovets-Vologda-Vyatka line (1902), Volkhov (1902), Amur near Khabarovsk (1916) on the Trans-Siberian Railway and so forth. Yevhen Paton compared Proskouriakov's bridges to Pushkin's poems. In 1903, at the discretion of the Society of the Moscow-Kazan Railway, Proskouriakov was among other bridge-design professionals both domestic and foreign, who made a rough sketch for the bridge across the Volga River near Kazan with the largest span of long, similar to the Yenisei bridge. In 1904, Proskouriakov designed two arched steel double track rail bridges — Andreyevsky and Krasnoluzhsky across the Moscow River for the Moscow Circular Railway. Both twin bridges were located within the city limits, and their graceful appearance fully satisfied the demands imposed to urban buildings at that period in time. It is worth noting that those bridges were first in Russia's railroad network that had crescent arch spans. One more important achievement in bridge engineering