Here is a small list of MTH trackside signals put together while researching the RK Pennsy Bridge Signal recently. I thought maybe others may find it handy. Note this is only trackside signals; does not include traffic signals, barricades, etc.
Partial List of Railking O Scale Signals
30-11005 3 Color Target Post Block Signal
30-11006* 8 Light Modern Cantilever Crossing Signal
30-11009* 2 Track 3 Color Cantilever Block Signal (up to 4 heads)
30-11009A* 2 Addon 3 Color Heads for above
30-11010 Cantilever Flashing Road Crossing Signal
30-11011 3 Color Target Dwarf Signal
30-11012* Crossing gate Signal Set-2
30-11013 7 Light Target Post Block Signal
30-11014* 4 Light Crossbuck Crossing Set-2 with sound
30-11023* 3 Position 3 Color Semaphore Signal
30-11024 3 Over 3 Color Vertical Post Block Signal
30-11025 Red Over Red 2 Light Post Block Signal
30-11030* 2 Track 7 Light 4 Head Pennsy Bridge Target Signal (up to 4 heads)
30-11030A 2 Addon 7 Light Heads for above
30-11035 3 Over 3, 2 Head Target Post Block Signal
30-11036* 3 Color Single Head Vertical Post Block Signal (green/yellow/red)
30-11038* 2 Light Modern Dwarf Signal
“*” Designates cataloged as of 2020
Please shoot me an email with any errors or omissions.
Rod