- tube train
- tube transportation
- tug
- tumblehome
- trial period
- trip anchor
- tripping bracket
- TRISEC ship
- trolley pole
- truck factor
- truck frame
- trolley car
- trolley system
- truck driver
- truck lane
- tsunami
- turbine wheel
- turbojet
- turbopropeller
- turbostrain
- turn
- turn buckle
- turn rail
- turnaround
- turning
- turning circle
- turning lane
- turning movements
- turntable bridge
- tyre heating
- tyre profile
- unbalanced rudder
- unbraked axle
- uncouple
- uncoupling device
- uncoupling rigging
- turning basin
- turnout
- turnpike
- turnround
- turnround time
- turntable
- tweendeck
- twin tunnel
- uncoupling
- under way
- undercurrent
- twin propellers
- twin wheels
- ultrasonic detector
- unbalanced acceleration
- undercarriage
- underframe
- underground bus
- underground hog
- undercutting
- undercutting machine
- undergrade bridge
- undergrade crossing
- underground
- undermanned
- underwater hull
- uninterrupted flow
- underhung rudder
- undersea pipeline
- undershoot
- undertow
- unmanned train
- unmooring
- unmoor
- unseaworthy
- unship
- unsplittable train
- unsurfaced shoulder
- uphill length
- upper surface
- usance bill
- unserviceable areas
- unstick speed
- upholstered seat
- upset
- upper deck
- upper works
- urban
- User Packet
- V-tail
- vacumm brake
- vacuum suspension
- valley station
- valve train
- van
- vane relay
- vehicle
- vehicle load
- velocipede
- velocity gun
- ventilator light
- variable costing
- vigilance control
- ventilating shutter