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Feathered Aspect: Clear/Caution, proceed expecting diversion at next junction as indicated by feather, drive in accordance with relevant signal aspect1. Flashing Yellow Aspect: Caution, proceed, continue to brake towards speed indicated, expect feathered aspect at next signal4. Flashing Double Yellow Aspect: Preliminary caution, proceed initialising brake towards upcoming speed restriction as indicated3. Yellow Aspect: Caution, proceed and preparing to stop at next signal2. Double Yellow Aspect: Preliminary caution, proceed expecting caution at next signal3. Simulator-based training is an excellent way to expose train crews to a.2.