Serge NOEL
141 lines
5.3 KiB
Plaintext
141 lines
5.3 KiB
Plaintext
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<title>N&W 1981 Signaling Definition</title>
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<h2>N&W 1981 Signal Definitions</h2>
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This directory contains signaling definitions corresponding to the Norfolk and Western 1981
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rule book and applies to color position light, color light, search light, and semaphore
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signals. These definitions cover the former N&W, Virginian, Nickel Plate, Wabash,
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P&WV, and ACY territories.
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<h3>Color Position Light Signals</h3>
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The 2 arm version of the NW CPLs are illustrated using two complete round faces. In the
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field, the actual signal may not have included a complete face depending on the indications
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needed for a given location. In general, a two arm signal would be used at an interlocking or
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as the advance signal for an interlocking. Signal installations at the end of a siding may
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only have a single head. A number plate was drawn on the Rule 291 signal icon to show a stop
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and proceed indication.
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<p>The single arm absolute signals include a single marker for the stop and stay indication.
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I have mapped the single red marker to lunar so that a signal decoder such as the Team
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Digital SHD2 can drive the entire signal off 4 outputs.</p>
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<p>The rule book illustrates two versions of the NW CPL dwarf. Early versions of this style
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dwarf had the arc from 12 to 3-o-clock position. Due to clearnance issues, the arc was change
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to the 9 to 12-o-clock position. I don't know if this changed the aspects the signal could
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display. I am assuming that either version could display the up to 4 aspects. There is a stop
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and proceed version that includes a numbner plate. The left lower red light is mapped to
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lunar based on the later version of the signal.</p>
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<h3>Color Light, Search Light, and Semaphore Signals</h3>
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<p>These signals encompass the all of the non color position light signals. The rule book
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does not really make a distinction between the types of signal heads. The images in the rule
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book are drawn as possible semaphore signals with the exception of the indications which have
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a lunar light. In those rules, separate signal images were drawn without semaphore blades
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showing the lunar aspect.</p>
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<p>I believe the signals with lunar aspects are of Wabash origin. They allow for a complete
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set of aspects with two arms in locations that would typically take three.</p>
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<p>See the <a href="aspects.xml">aspect page</a>.</p>
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<p>Signal Mast definitions:</p>
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<ul>
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<li>
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<a href="appearance-CPL-1-arm-absolute.xml">Single Arm Absolute Color Position Light Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-CPL-1-arm-permissive.xml">Single Arm Permissive Color Light Position
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Mast Signals</a>
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</li>
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<li>
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<a href="appearance-CPL-2-arm-absolute.xml">2 Arm Absolute Color Position Light Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-CPL-2-arm-permissive.xml">2 Arm Permissive Color Position Light Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-CPL-Dwarf-absolute.xml">Absolute Color Position Light Dwarf
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Signals</a>
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</li>
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<li>
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<a href="appearance-CPL-Dwarf-permissive.xml">Permissive Color Position Light Dwarf
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-1-high-absolute.xml">Color Light Single Arm Absolute Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-1-high-permissive.xml">Color Light Single Arm Permissive Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-1-low-absolute.xml">Color Light Single Arm Absolute Dwarf
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-1-low-permissive.xml">Color Light Single Arm Permissive Dwarf
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-2-high-absolute.xml">Color Light 2 Arm Absolute Mast Signals</a>
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</li>
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<li>
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<a href="appearance-SL-2-high-permissive.xml">Color Light 2 Arm Permissive Mast
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Signals</a>
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</li>
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<li>
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<a href="appearance-SL-2-low-absolute.xml">Color Light 2 Arm Absolute Dwarf Signals</a>
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</li>
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<li>
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<a href="appearance-SL-3-high-absolute.xml">Color Light 3 Arm Absolute Mast Signals</a>
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</li>
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<li>
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<a href="appearance-Wab-2-high-absolute.xml">Color Light 2 Arm Absolute Mast Signals with
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Lunar Aspects</a>
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</li>
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<li>
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<a href="appearance-Wab-2-low-absolute.xml">Color Light 2 Arm Absolute Dwarf Signals with
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Lunar Aspects</a>
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</li>
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</ul>
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