Việt
lớp balát
lớp balat
nền đường sắt
Anh
railway bed
ground-work
platform
rail bed
railway formation
track bed
ballast bed
ballast cover
bottoming
cushion course
tie-bed
ground-work, platform, rail bed, railway bed,railway formation, track bed
ballast bed, ballast cover, bottoming, cushion course, railway bed, tie-bed