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- ridership 1
- ridesharing 3
- ridge beam 2
- riding profile 1
- riding surface 1
- right 1
- right of exploitation 2
- right to work 1
- rigid and flexible 1
- rigidity 2
- rigidity and crack-resistance of the ferro-concrete bases for want of axisymmetrical irregular heat 1
- rigidity and dissipation of rail supports 1
- rigidity of a side stop 1
- ring effect 2
- ring of the lower level 2
- ring of the upper level 2
- ring routes 2
- ripper 1
- ripple traffic 2
- rise of efficiency of activity of suburban passenger transportations 1