機器
curve
destination
detail
dirty
energy
engine
grey
immobile
industrial
industry
iron
joint
journey
junction
land
link
metal
motionless
object
old
pedicle
power
rail
railroad
railway
road
rust
rusty
stack
station
stationary
steel
stone
strength
stub
system
technology
track
traditional
traffic
train
transit
transport
transportation
travel
vintage
wheel