What action should a train take when stopped at an automatic railroad crossing at grade with a stop signal and no conflicting movement is evident?

When a train encounters a stop signal at an automatic railroad crossing at grade and observes no conflicting movements, compliance with special instructions is essential. This option is correct because special instructions are often put in place to ensure the safety and proper operation of trains at specific locations, including crossings. These instructions may be derived from the operating authority’s rules, local conditions, or emergency procedures tailored for that particular crossing.

The necessity of adhering to special instructions underscores the importance of situational awareness and communication in train operations. Each crossing may come with unique instructions that dictate how a train should proceed under various scenarios. Therefore, following those guidelines ensures safety and prevents potential accidents, even when the immediate surroundings appear clear.

The other choices do not adequately address the critical need for following established procedures in train operations. For instance, proceeding without stopping disregards safety protocols, while waiting for clearance from a bridge tender applies more specifically to situations involving bridges rather than crossings. Signaling for assistance may be unnecessary in this scenario if no conflicting movements are present, making it an inappropriate action.