This is a controller for a model railroad fastclock. That clock looks like a normal clock, but runs at a higher speed than usual. This is used to compensate the fact, that distances on the model railroad are not properly to scale, as that would need much huger locations and setup than possible.

The tasks of the master clock / controller is:

set the correct time
set the speed of the clock
start/stop the clock
inform client clocks about the current time to be displayed
support multiple clock systems, as we have multiple arrangements of model railroads at the same location having their own times

Links / References

Digitrax Loconet PE: http://www.digitrax.com/static/apps/cms/media/documents/loconet/loconetpersonaledition.pdf
- we do not support loconet yet, but it is an option to be added later
- see page 14 ff. about FAST Clock definitions
Rocrail with a description of the loconet interface (German): https://wiki.rocrail.net/doku.php?id=loconet:ln-pe-de
List of loconet interfaces: http://loconetovertcp.sourceforge.net/Client/index.html, and here especially the fast clock: http://loconetovertcp.cvs.sourceforge.net/loconetovertcp/tcp/client/Clock/
FREMO had some discussions about fast clocks, see the forum (available to members only)