alloy
backdrop
background
black
bump
cooling
corroded
dark
detail
dirty
durable
engine
fallout
gear
gray
grey
grunge
history
industrial
industry
iron
locomotive
material
memory
metal
metallic
old
out of order
painted
pattern
power
railroad
remembrance
retro
rough
rusty
shaft
steam
steel
strong
surface
texture
train
truck
vintage
wasteland