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- riding surface 1
- right 1
- right of exploitation 2
- rigid and flexible 1
- rigidity 2
- rigidity and crack-resistance of the ferro-concrete bases for want of axisymmetrical irregular heat 1
- rigidity of a side stop 1
- ring effect 2
- ring of the lower level 2
- ring of the upper level 2
- ripple traffic 2
- rise of efficiency of activity of suburban passenger transportations 1
- risk 56
- risk analysis 1
- risk assessment 2
- risk assessment methods 3
- risk control 1
- risk density function 1
- risk descriptions 1
- risk estimation 1