The oldest part of the Moscow-Yaroslavl-Arkhangelsk railway was built just a few years after the company was founded on 29 May 1859. It is about  long railway line between Moscow and the city of Sergiyev Posad, where the famous Trinity Monastery was located.
From a continuation of the route over Sergiev Posad addition was initially not mentioned. The main initiator of the track construction was the military engineer Baron Andrei Ivanovich Delwig (1813-1887), later chief inspector of the Russian Railways and founder of one of the first railway technical schools in Russia.