RAILWAY UPDATE
Here are some common air brake troubleshooting tips for the Wag12b locomotive:

Check the brake pipe pressure. The brake pipe pressure should be at least 5 kg/cm2 when the locomotive is in the running position. If the brake pipe pressure is low, it could be due to a leak in the air brake system.
Check the air compressor. The air compressor should be running and the pressure gauge should show that it is producing air. If the air compressor is not running, it could be due to a problem with the electrical system or the compressor itself.
Check the brake valves. The automatic brake valve and the independent brake valve should be in the correct position. If they are not, it could cause the brakes to not work properly.
Check the brake cylinders. The brake cylinders should have at least 50 psi of pressure when the brakes are applied. If the brake cylinders do not have enough pressure, it could be due to a leak in the brake line or a problem with the brake cylinder itself.
Check the brake shoes. The brake shoes should be in good condition and should not be worn down. If the brake shoes are worn down, they will not be able to grip the wheels properly and the brakes will not work properly.
If you have checked all of these things and the air brakes are still not working properly, you should contact a qualified locomotive mechanic for further assistance.

Here are some additional tips for troubleshooting air brakes on the Wag12b locomotive:

Perform a brake continuity test. This test will check for leaks in the air brake system.
Perform a brake power test. This test will check the pressure of the air brake system.
Perform a break feel test. This test will check the feel of the brakes when they are applied.
If you perform these tests and you are still unable to identify the problem, you should contact a qualified locomotive mechanic for further assistance.

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