blue
cable
cables
cabling
connection
current
danger
detail
electric
electrical
electricity
energetic
energy
grid
high
industrial
industry
infrastructure
line
locomotive
metal
modern
network
overhead
pantograph
pole
power
public
rail
railroad
railway
railways
roof
sky
station
structure
supply
system
technology
traffic
train
tram
transport
transportation
travel
trolley
voltage
wagon
wire
wired