Main Topics: 1.Mechanical behaviour of soil and aggregate in transportation in cold regions 2.Coupled modelling of mechanical and physical processes in transportation soil for cold regions 3.Slope stability of embankments and their foundations in permafrost 4.Frost heave in ballast and subgrade beneath slab track 5.Thaw weakening of soil in transportation 6.Field measurement of stress, deformation, temperature, moisture 7.Long-term evaluation of subgrade functionality 8.Nondestructive evaluation of subgrade soils and aggregate layers in cold regions 9.Water-heating mode subgrade in cold regions 10.Protection of subgrade from avalanches