What is the default position for fixed derails used for blue signal protection?

The default position for fixed derails used for blue signal protection is in the derailing position. This is because these derails are specifically designed to prevent unauthorized movements of rolling stock in areas where workers are performing safety-critical tasks. By being in the derailing position, the derail actively protects personnel by ensuring that any movement of trains or equipment toward the work zone is effectively blocked.

This position is crucial for maintaining safety as it limits access to areas where workers are present, thereby preventing potential accidents that could occur if trains were allowed to move into those areas without proper safeguarding measures in place. The protocol emphasizes maintaining a strict adherence to safety, with fixes derails positioned to disrupt any unexpected train movements while blue signals are displayed.