BGAS Hall Disc, Single - MagnumMacKivler/trakpak3 GitHub Wiki

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Hall Disc signals, or "Banjo signals" as they are commonly referred by, are an early form of electric automated block signalling. They could be found on some of the richer railroads (such as the Reading) in the late 1800s to as late as the early 1940s. Simple in design and operation, and fail-safe in the event of power loss, their main drawback was only being able to display two aspects per head.

High and Three-Position Dwarf Signals

models/trakpak3_us/signals/hall-disc/rg.mdl

models/trakpak3_us/signals/hall-disc/yg.mdl

The model name describes the colors the signals can display; r for Red, l for Lunar, y for Yellow, g for Green, and x for Any. If a model can't display a color (e.g. ryg.mdl attempting to show Lunar), it will default to Off. Note: rg has a provision to display ry instead. Refer to the BGAS chart.

Bodygroups, Animation, and Skins:

Sequence name: range

Option	Aspect Displayed	Animation Cycle^	Second Lens Color (BG1)	Night Lamp (BG2)	Mounting (BG3)	Skin
0	Restrictive Aspect	0.0	No second lens	Daytime operation (lamp off)	Mounting, signal's left	Silver mount
1	Permissive Aspect	1.0	Green (yg only) or Yellow (rg only)	Nighttime operation (lamp on)	Mounting, signal's right	Black mount
2	-	-	Green (rg only)	-	No mounting

This signal does not conform to the Trakpak3 Standard Color Arrangement (SCA)

^Animation Cycle is a floating point value describing where along the sequence the animation is at. For example, 0.0 is at the very beginning, 0.5 is halfway through, and 1.0 is at the end.

Further explanation: Second lens color (BG1) is the lens that is over the night lamp when the animation cycle is at 1. The signal rg supports either no lens (lunar is displayed when signal is at animation cycle 1), a yellow second lens (yellow is displayed) or green (green is displayed instead) The signal yg only supports no lens (re: lunar), or a green lens for the second lens.