英文關鍵字
train
track
tracks
trackbed
layers
peeling
view
shot
surface
wear
tear
deterioration
damage
degradation
rust
dirt
debris
infrastructure
transportation
railway
railroad
system
public
transit
rail
network
freight
passenger
cargo
logistics
travel
commuter
commute
line
maintenance
repair
inspection
safety
hazard
structural
integrity
engineering
civil
construction
material