There is only a slight clearance between sides of cars and signal-towers.
IF YOU EXPECT TO SEE THE NEXT BLOCK KEEP YOURS INSIDE.
There was another one worded as follows:
YOUR HEAD MAY BE HARD
But not so hard as Bridges and Tunnel Arches.
Railway company will hold you responsible for damages to bridges and tunnels and signal-towers—they are not insured.
KEEP YOUR BLOCK INSIDE
And yet another:
Huns are waiting.
Trenches ahead.
Speed up.