機器
blue
car
carriage
cars
coach
country
direction
drive
embankment
engine
forming
freight
groundwork
industry
infrastructure
iron
line
link
linking
locomotive
machinery
manage
mechanic
metal
move
multiple
permanent
pillar
pillars
point
pole
poles
post
posts
power
queue
rail
railcars
railroad
railway
road
rocks
service
sky
speed
steel
stones
straight
switch
tie
ties
track
tracks
traffic
train
traincars
trains
trainyard
transit
transport
transportation
transporting
turn
urban
way
wire
wires
yard
yards