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CTC Hold signal

A CTC hold signal normally is the last intermediate signal before an important CTC control point, such as a yard entry. It behaves like an intermediate APB signal, but it is controlled and does not automatically clear, thus allowing the dispatcher to hold trains back. Arvada, CO on the ex-DRGW Moffat Road is a nice example (take a look at Kevin Morgan's CTC panel of the Sub here, in the middle left.
I plan to use it at the entrance into CTC territory, where a non-signaled station is at the head of a section of line.

From a hardware point of view, the module is based on the APB intermediate signals, which it shares schematic and PCB with. The software is derived from the CTC Control Point logic, stripped of turnout control.

Documentation and Source Code

Schematics

Source code