For the English full text of the article please see the attached PDF-File (English version follows Russian version).ABSTRACT A variant of modernization of a bogie of 18-100 freight cars through installation of roller guides, which will make its frame more rigid, is being considered. The problem of rigidity of a three-element frame has long been one of the basic ones. Many scientists suggested installing cross connections, but this design was not always reliable, the cross connection was often simply deformed or broken, because, along with other aspects, it added 150-200 kg to the sprung mass of the bogie. Others suggested to put on the bogie wear-resistant, elastic elements, wheel sets with cassette bearings. Such changes in the design led to an improvement in dynamic performance, but did not solve the main problem. In the published article, the task is to uncover a new idea of modernizing the bogie, which is intended to reverse the trend that marked the transition of domestic cars to Barber S-2-R and Motion Control bogies. Keywords: railway, freight car, bogie 18-100, modernization, guide rollers, dynamics, cross connection, undercarriage parts of a car.