Mount Hood's last major eruption occurred in the 1790's not long before Lewis and Clark's expedition to the Pacific Northwest. In the mid-1800's, local residents reported minor explosive activity, but since that time the volcano has been quiet.
Signal Colors and Their Meaning. The colors used in today's signals are green, yellow, red, lunar, and white (remember, we're talking about signals in North America). The color of a signal tells the engineer what he has to do, the location of that color, determines the speed at which he is allowed to do it.We will get to the speed thing in a minute.he colors used in today's signals are green, yellow, red, lunar, and white (remember, we're talking about signals in North America). The color of a signal tells the engineer what he has to do, the location of that color, determines the speed at which he is allowed to do it. We will get to the speed thing in a minute.
One very important part of these rules is the section on Fixed Signals. They are a means of communicating instructions to engineers, trainmen, and on track equipment. 2. One signal system used is the COLOR LIGHT SIGNAL SYSTEM.The three colors used are RED, GREEN, AND YELLOW. The names ordinarily associated with the colors are STOP with RED, CLEAR with GREEN and APPROACH with YELLOW. 3. Single, Double, or Triple COLOR LIGHTS may be used to convey instructions to engineers and trainmen.ne very important part of these rules is the section on Fixed Signals. They are a means of communicating instructions to engineers, trainmen, and on track equipment. 2. One signal system used is the COLOR LIGHT SIGNAL SYSTEM.