The paper covers some issues of safety and continuous work on railroads at northern parts of the Russian Far East. The most important issue in the trackside is providing the rail roadbed stability. The problems of certain destabilization factors and their impact are not completely solved despite a great amount of publications and standard regulations. The solutions are vital for the permafrost sections where high temperatures occur. It is necessary to eliminate the causes of destabilization promptly and to have a forecast for an assessment of the roadbed repair and maintenance costs in the conditions of increased traffic, under an increased vibro-dynamic impact on the track in particular. It is connected with temperature and humidity abnormalities in permafrost under the vibro-dynamic loads in a multiyear thawing.
The most negative effect on the subgrade deformation is produced by a vibro-dynamic impact appearing from class repairs of the track carried out by the maintenance vehicles. The effect enhances during the pre-winter season. The paper covers the experiments with the maintenance vehicles that provide data to be processed in building the “vehicle-track structure-embankment-subgrade” model.

thawed permafrost, temperature and humidity abnormalities, ballast filling, first costs, vibro-dynamic impact