Position of Tongue Rails on a Railway Track

The correct answer is option B, which states that the position of tongue rails on a railway track is between two stock rails. Let's explore this answer in detail:

Introduction to Railway Track Components
- A railway track is made up of various components that work together to provide a safe and efficient transportation system for trains.
- These components include rails, sleepers (or ties), ballast, and various fittings.

Tongue Rails
- Tongue rails are a type of railway track component that are used in turnouts or switches.
- Turnouts are sections of track that allow trains to move from one track to another, either to change direction or to switch to a different track.
- Tongue rails are movable rails that are positioned between the stock rails in a turnout.

Stock Rails
- Stock rails are the main rails of a turnout and are the fixed rails that guide the train through the turnout.
- They are positioned on the outer edges of the turnout and provide a continuous running surface for the train.

Position of Tongue Rails
- The tongue rails are positioned between the two stock rails in a turnout.
- They are aligned with the stock rails when the turnout is in the "straight" position, allowing the train to continue along the main track without any diversion.
- When the turnout is in the "diverging" position, the tongue rails move to one side, creating a path for the train to switch to a different track.

Function of Tongue Rails
- The primary function of tongue rails is to guide the train from the main track to the desired track in a turnout.
- When the train approaches a turnout, the position of the tongue rails is controlled by the switch mechanism.
- The switch mechanism allows the tongue rails to move to the desired position, aligning with the stock rails to create a smooth transition for the train.

Conclusion
- In conclusion, the correct position of tongue rails on a railway track is between two stock rails in a turnout.
- Tongue rails play a crucial role in guiding trains through turnouts and allowing them to switch tracks safely and efficiently.