The danger and chance of off road collisions, amount of traffic, and the cost to put them in.
yes
They're called taff rails, especially at the stern of the ship
Boxes and rails are placed in snowboard parks snowboarders are sliding them.
The inside rails inside of the main rails are called guard rails. They are there so that if there is a derailment the train will stay within the rails instead of off of the trestle.
3
help you keep your balance. usually placed in stairways.
alfred l cralle
3
3
2 running rails. There may be a power rail ("the third rail") There may be guard rails at places like bridges and curves (there always are short ones at turnouts ("switches").
to reduce the pressure exerted by the train
Rails curve when there are two rails placed at right angles to it. So if you form an L shape, the corner one will be curved.