When I was reading this title, i was reminded of that stupid saying… If a tree falls in the woods, and no one is around, did it make a sound?
So first off: YES! Anyhting in motion that comesin contact with something not in motion will cause an audible noise, depending on the speed and material used in construction- it may make a huge noise rather then sound.
Now for this: It was my impression, and is in the CP rail rule book that:
Any Crossing that does not meet the ‘100% gaurded’ category is not only subject to the standard crossing-whistle pattern, it is subject to any noise, at any volume in order to keep A) the crossing clear, or B) People near by informed.
Here is what is required for complete crossing protection (According to CP rail)
1- Standard Reflective Crossbuck
2- Lights ( Red in colour) along with Bell (1 or 2 audible tones per second)-
3- Gates that block a minimum of one lane of traffic or an entire sidewalk.
4- Speed Detector- Calculates speed and distance of an approaching train so the system can time accurately when to lower the gates, and when to raise them-
With those four things, a Crossing is 100% protected, and is immediately placed on the roll to be evaluated for a cease-whistle status. Once it has been granted, any Engineer caught blowing at these crossings without valid reason wouldcome under severe penalties.
If you have a crossing that meets numbers 1-3, you have a crossing that is only 95% protected,or .95
This crossing can still have awhistle exemption, but an engineer is not subject to any ruling regarding whistleing- if need be, he can use the horn as much as needed, and any complaintes generated will simply be returned, asking the municipality to upgrade crossing equipment.
And lastly- Like most crossings, if it only meets sections 1 and 2,or just secion 1 all by itslef, it can in no way be exempted from whistling. Engineers are encouragedtouse the horn as loud as possible in th