🔍 Key Concepts

• Engine Order Telegraph (EOT) sequence: wheelhouse/bridge orders → engine room indicator → actual engine direction • The role of the throttle/engine direction feedback shown near the bottom of the control room EOT in EL-0113 • How the Wrong Direction Bell and Indicator Lamps are wired compared with the normal order bells and indicators

💭 Think About

• Trace the wiring from the wrong direction bell/indicator lamps back to their source: is it being controlled by the transmitters/indicators, or by a feedback from the engine direction? • Ask yourself what specific mismatch this alarm is intended to warn the engineer about: is it a disagreement between two indicators, or between an indicator and the real engine movement? • Look at the transfer relay circuits: do they interact directly with the wrong direction alarm circuit, or only with which station has control?

✅ Before You Answer

• Identify what device the wrong direction alarm contacts are mechanically linked to (indicator pointer vs engine direction switches). • Verify whether any leads from the transfer relays go into the wrong direction alarm section of the diagram. • Confirm whether the alarm circuit is completed only when the engine direction feedback disagrees with the commanded position shown on the engine room indicator.