- blind landing
- blind sag
- blind sector
- block
- block apparatus
- block derail
- block equipment
- block system
- block train
- blocked line
- blocked track
- boarding platform
- boat
- boat elevator
- boat lift
- boat load
- boat sling
- boat tank
- boat traniler
- boatswain
- bob stay
- bogie bolster
- bogie centre
- bogie truck
- bonded goods
- bonded warehouse
- Book value
- boom
- boom guy
- boost charge
- booster locomotive
- boot topping
- border station
- bored axle
- bottle screw
- bottom
- bottom rod
- bouncing
- boundary light
- boundary lubrication
- bow chock
- bow door
- bow line
- bow suspension
- box
- box pallet
- blower fan
- blue peter
- board
- boat chock
- boat fall
- boat house
- body
- body oscillation
- body shell
- bogie
- bogie brake
- bogie frame
- bogie weight
- bollard
- bolster
- bolster clearance
- bolster deflection
- bolster guide
- bolster stiffener
- bolster webs
- bond plug
- booster pump
- bottom plating
- bracket
- brake blending
- brake head
- brake inspection
- brake lever
- brake reaction
- brake wagon
- brake weight
- brakescrew support
- braking airscrew
- braking capacity
- braking deceleration
- braking stage
- braking switchgroup
- branch
- branch pipe
- breakdown train
- breakdown wagon
- breeches buoy
- bridge over
- bridge warning
- braking step
- braking time
- breadown train
- break-bulkhead
- breaker
- breast line
- broken base
- broad sleeper
- broken-backed
- buckled track