This work, which is the next issue of the historical and biographical series of Mashgiz, aims to cover the life and work of outstanding innovators of Russian technology of the 18th century. - the creator of grandiose hydraulic structures and mining machines K. D. Frolov (1726-1800), far ahead of his contemporaries in the West, his son, II. K. Frolov (1775-1839), who built the first Russian railway outside the factory yard and put forward the world's most daring large rail road projects of that time. The book is intended for a wide range of readers.