Folks an interesting presentation on signals:

http://www.youtube.com/watch?v=3Sow8O1_ZNA&feature=related

Model RR signal. I remember I was having a tough time just putting my toy train one together on my Christmas layout:  

As an aside, just like today, my wife said to get a few plants for the front porch and I came back with a bunch of silk flowers..... (can't get anything right!). 

http://www.youtube.com/watch?v=OvAg_Tru6JI&feature=related

These might come in handy, (I don't know) for some model railroaders. 

Installing Signals at the Club Layout

http://www.youtube.com/watch?v=i9-cf_48io8&feature=related

The gates are made by NJ International, the controller is by Grade crossing Pro and the bell sound unit is by ITT.Gates are controlled by Tortoises by I recommend getting a Switch Master switch machine:

http://www.youtube.com/watch?v=tMaFD18O5BE&feature=related

Prairie