Answer :
Final answer:
The rail on the side of the frog guiding wheels is called a Check rail, designed to keep wheels on track and prevent derailment at complex junctions.
Explanation:
The rail on the side of the frog guiding wheels is called a Check rail. The purpose of a check rail is to prevent the wheel flange from touching the frog directly, which can cause derailment. It is a safety feature in the rail system that ensures wheels move smoothly through complex sets of switches or crossings within a rail yard.
Guard rails, which are different from check rails, also play a crucial role in the safety of railway travel. They are placed parallel to running rails in certain locations such as bridges, viaducts, and other structures to prevent a derailed train from traveling too far away from the tracks.
