ballast
beams
bed
closeup
connection
conveyance
course
direction
equipment
freight
gravel
grey
industry
infrastructure
lean
line
long
metal
parallel
patterned
perspective
rail
railroad
railway
repeat
route
row
rust
rusty
sleepers
slope
solid
steel
stones
stony
strong
structure
technology
ties
track
traffic
trail
train
transit
transportation
way
wide