bright

car

cargo

construction

drum

electric

engine

engineering

equipment

factory

fire

foundry

fuel

furnace

heat

heavy

hot

industrial

industry

iron

locomotive

machine

manufacture

manufacturing

melting

metal

metallurgy

mill

motor

move

music

old

outside

part

pipes

plant

power

production

railway

red

rock

steam

steel

technology

tool

trails

train

transportation

work

workshop