Is Rule 409 in effect at all interlockings, as affected by Rule 410?

The correct understanding of Rule 409 suggests that it is not universally applied at every interlocking but may have exceptions depending on certain conditions. This aligns with the nature of many operational rules which can have specific clauses or situations that alter their applicability. Rule 410 likely outlines these exceptions, indicating circumstances under which Rule 409 would not apply at an interlocking. This contextual relationship is important for ensuring that safety protocols are adhered to based on real-time situations that may arise, allowing for operational flexibility while maintaining safety standards. Thus, recognizing that there are times when Rule 409 is not in effect at all interlockings is crucial for proper compliance with LIRR operating procedures.