JamesLit wrote:I've got them, I'll upload for you....
EDIT: tada! https://dl.dropboxusercontent.com/u/37636253/TSD/Pro%20Signals.zip
I took a look and found that these signals do not support theatre-box style indicators. The just know left, right, and straight. So if you want two letters to show, you make them lights that are shown when the route is set to "left" and "right". More than that is not covered.
(This finding was such a blow that I forgot to submit the post. )