bathroom

bowl

carriage

clean

closet

conveniences

dirty

drain

equipment

facilities

flush

flushing

going

hygiene

indoors

industrial

inside

interior

lavatory

lid

metal

moving

old

passenger

pedal

public

rail

railroad

railway

restroom

room

sanitary

seat

sink

speed

stainless

steel

the

toilet

toilette

train

transport

transportation

travel

unclean

unhygienic

vehicle

water