金属産業
antique
brake
car
closeup
coal
construction industry
engine
engineer
engineering
equipment
factory
freight transportation
fuel and power generation
generator
heavy
industry
iron
land vehicle
locomotive
machine part
machinery
macro
manufacturing
manufacturing equipment
mechanic
metal
metal worker
metallic
mode of transport
motion
occupation
old
part of
propeller
railroad track
repairing
rusty
service
speed
steam
steam train
steel
technology
transportation
turning
wheel
working
workshop