Just a heads-up . . . . and no, I'm not in marketing nor do I represent a manufacturer or retail outlet!
I model the Rathole line (in HO scale) so for years have been planning to kit-bash some signal bridges as seen on the real CNO&TP line. I imagine others on this Forum model the same region.
The Feb. '08 issue of the NMRA's Scale Rails arrived today with the announcement of a Southern Sill Gantry, fully assembled from Integrated Signal System , in the $185 range. While ISS's website doesn't show the new units yet (under "new" news), I found this link on TrainCat's website.
http://traincat2.com/d_sousill.htm
It looks very cool, and I will likely get one or two of them for my layout.
BTW, a great photo of the signal system is on the cover of Model Railroader's November '07 issue: http://www.trains.com/mrr/default.aspx?c=i&id=2&iid=261
Just sharing . . . . RDS