On which side of the track are kilometer pegs placed?

Kilometer pegs are positioned on the DOWN side of the track as part of standardized railway practices. The purpose of these pegs is to provide a clear reference for train operators and signal personnel regarding distance along the railway line. This placement helps in identifying locations of signals, points, and other crucial features that are vital for safe and efficient train operations.

The DOWN side refers to the direction in which trains travel away from the central terminus, typically the direction towards the main hub of the rail network. Placing kilometer pegs only on the DOWN side helps maintain consistency in tracking distances and improves communication among railway staff, ensuring that everyone is following the same reference points.

In contrast, the other options imply varied placements that may lead to confusion or inconsistency in rail operations, which is why they do not align with established practices.