The correct answer is C. traverser.
A traverser is a railway track-switching device that allows railway vehicles to be transferred from one track to another without the need to shunt them. It is a type of movable bridge that spans the two tracks and can be moved to align with either track.
A triangle is a railway track-switching device that allows railway vehicles to be transferred from one track to another by reversing their direction. It is a Y-shaped track arrangement with two main tracks and a connecting track. The railway vehicle is moved onto the connecting track and then reversed onto the desired track.
A turntable is a railway track-switching device that allows railway vehicles to be rotated 360 degrees. It is a circular platform with a central pivot that the railway vehicle is placed on. The turntable is then rotated to the desired track.
A scotch block is a railway track-switching device that allows railway vehicles to be stopped on a particular track. It is a small, wedge-shaped device that is placed between the rails of the track. The railway vehicle then runs over the scotch block, which causes it to stop.
In conclusion, the correct answer is C. traverser. A traverser is a railway track-switching device that allows railway vehicles to be transferred from one track to another without the need to shunt them. It is a type of movable bridge that spans the two tracks and can be moved to align with either track.