Monorail Trigger Track
Track element for the "Custom Rail System" (CRS) providing a "trigger" point. The trigger uses an NXT touch sensor to detect the train passing on the track. This can be used to automate functions of the CRS such as switches. Am example of the trigger track in use can be see in this video. The NXT program used to control the switches (which is available for download) can be found in this EuroBricks forum posting.