What does a green arrow at 45 degrees indicate regarding mainline points?

A green arrow displayed at a 45-degree angle typically signifies that the mainline points are set for the mainline. This positioning indicates to train operators that the track configuration is directed for use on the mainline track, allowing trains to proceed safely without the need to divert or change their route.

The significance of this signal is that it confirms the readiness of the mainline track for operational use, ensuring a smooth flow of train traffic. Understanding this indication is essential for maintaining safety and efficiency in railway operations, as it helps prevent misrouting and potential accidents. Properly trained personnel must recognize these signals to make informed decisions while managing train movements.