beijing
change
connection
crossing
decide
decision
different
direction
exchange
forward
good
gravel
high
horizontal
in a row
industry
infrastructure
iron
junction
line
logistic
move
movement
network
no people
old
perspective
rail
railroad
railway
right
road
route
separation
sky
speed
steel
subway
switch
technology
track
traffic
train
tranquility
transit
transportation
tunnel
way
wrong