6. Four signals, all of them what the crew sees and hears

Note. THIS IS THE RAILROAD'S OWN SIDE OF WHAT REQUIREMENT 5 COVERED FROM THE ROAD, AND ALL FOUR PARTS ARE REQUIRED. 6(a) asks you to SHOW two basic signal types as well as explain how signals operate, so decide early what you are going to show: a drawing, a model, or a photograph you can talk over. 6(b) is three horn signals with their meanings, of which the crossing sequence is the one everybody has heard. 6(d) asks for the USE AND FUNCTION of the end-of-train device, which is two answers rather than one. 6(c) IS THE PART WORTH LEARNING PROPERLY: how to signal a train for an emergency stop is knowledge you would use once in a lifetime and be very glad to have. Read it alongside what requirement 4 taught you about stopping distances, because that is what decides how early the signal has to be given to be any use.