monolithic track bed；solid bed；integrated ballast bed；monolithic concrete bed
flat-bed-integrated antenna
low pressure integrated bed
asphalt cemented ballast bed
ballast bed with rubber bits
bituminous raodbed；asphalt roadbed；asphalt cemented ballast bed
Lateral Resistance of Ballast Bed
longitudinal resistance of ballast bed
Low ballast bed resistance section
mechanical regulating of ballast bed
ballast distributing and trimming machine；ballast distributing and regulating machine
ballast water and de-ballast water
annual temperature difference between track bed slab and bed plate
Circulating fluidized bed wity low velocity fore postied branch bed