When brakes applies is it applied only on loco motive or all the coaches with locomotives? It the basic question arise when we travel and see any train.
As I was working as a Loco Pilot for around 14 years, I am trying to share a very simple ideas of how brakes are applied in Locomotive and coaches in a simple way.
There are two types braking systems in a train.
First type of brake is only for locomotive (individual). It applies only on locomotive when applies by loco Pilot. It applies through a handle by loco pilot. The name of the brake handle or you may say the brake is SA-9.
When loco pilot applies SA-9 handle only locomotives brakes applies. It's function is limited to locomotives only. It has nothing to do with train of coaches brakes application.
Second type of brake is for both locomotive and coaches. It applies through a another handle A-9. As this brakes applies through A-9 handle so the bakes system is named as A-9 brakes.
When loco pilot applies A-9 handle both locomotive and coaches brakes applies simultaneously. Brakes applies on both locomotives and coaches.
In locomotive, there are two handles for two types of brakes. One is A9 for both Loco and train brakes and SA 9 for applying the brake in Loco only. You can get those on the below picture for your reference.
Application system of these two types of brakes are different in practical field.
in practical situation when a Loco pilot applies the brake with the A-9 brake handle brakes applied to both Loco and coaches.
But it is seen that in this situation Loco brakes apply on Locomotive faster than brakes apply on coaches. Then locomotive get the tendency to stop due to application of brakes on it's wheels. But coaches brakes are yet to applies. So there is a chance of push to Loco by the coaches.
If this happens Locomotive wheels skids on railway tracks due to pushing of coaches or wagons from rear and may damages Locomotive wheels and also railway tracks.
So it must be ensure that only coaches brakes are applied and not the Locomotives brakes when Loco Pilot apply brakes through A-9 brake application handle.
To ensure this a special pedal switch PVEF introduce in Locomotive. Loco pilot must press this switch when he applies brakes through A-9 Handel to his train.
This system ensures that no brakes will apply on Locomotive and only the brakes of coaches apply with the application of this A-9 handle.
There is also an electrical braking system in Locomotive.
In Electric Loco there are two types- Rheostat and Regenerative.
Regenerative braking system generates electricity and feeds that to OHE through panto graph.
Rheostat brakes also generate a small amount of electricity and it destroys through a resistance.
The regenerative braking system is more powerful than Rheostat braking system.
And in diesel locomotive, it is named Dynamic braking. It also generates electricity also destroy in a resistance.
These two types of bakes are applied in Locomotive only.
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