Diesel Loco Horn vs E Loco Horn76

Описание: In many railway systems, particularly the Indian Railways, there is a noticeable difference between the horns used on Diesel and Electric locomotives. While both serve the same safety purpose, their "voice" is distinct due to the air pressure systems and the specific equipment used.
Quick ComparisonWhy do they sound different?
1. Overcoming the "Engine Noise"
A diesel locomotive is essentially a giant moving power plant. The internal combustion engine creates a massive amount of low-frequency noise. To ensure the horn is heard by people near the tracks, the horn is tuned to a lower frequency (bass) that can punch through the engine’s own rumbleIn contrast, electric locomotives are much quieter. Their horns are tuned to a higher pitch to be more piercing, making them highly effective at alerting people even when the train is moving at very high speeds with less mechanical noise.
2. Air Pressure & Hardware
Both locomotives use compressed air to power the horn, but the hardware differs: Diesel Locos: Often use "Chime Horns" (like the Nathan K-series). These use multiple trumpets of different lengths to create a musical chord, resulting in a rich, deep sound.
Electric Locos: Commonly use "Dual Tone" horns. These are often smaller and operate at high pressure to produce a sharp "Hee-Hoo" sound that is extremely distinct and carries well over long distances.
3. Psychological Impact3. Psychological Impact
The deep "honk" of a diesel locomotive is often associated with heavy freight and raw power, while the sharp "scream" of an electric locomotive (like the WAP-7 or WAG-9) is the signature of modern, high-speed rail travel.
Meaning of Horn Codes
Regardless of the sound, the patterns (codes) remain the same across both types:
1 Short Blast: Train is going to the yard for cleaning2 Short Blasts: Signal to the guard to start the train.
1 Long + 1 Short: Guard to release brakes.
Intermittent Long Blasts: Approaching a level crossing or tunnel.
6 Short Blasts: Emergency or danger signal.
Would you like me to explain the specific horn codes used for shunting or emergency situations in more detail