They're called taff rails, especially at the stern of the ship
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.
yes
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alfred l cralle
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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").
A horse drawn wagon on rails is called a sled or sleigh.
crossword answer? ELS
ties
Handrails or bannisters
they are there so when the sow rolls over, she doesn't accidentally squish the piglets