機器
car
cars
change
changing
engine
forming
freight
industry
infrastructure
iron
line
link
linking
load
locomotive
machinery
manage
mechanic
move
multiple
positioning
power
queue
rail
railcars
railroad
railway
road
sort
sorting
speed
steel
switch
switching
track
tracks
train
traincars
trains
trainyard
transport
transportation
transporting
unload
urban
way
yard
yards