Sir in every loco both brakes i.e. Loco Brakes & Train Brakes are available.
A loco is not complete without both these brakes.
For example a train running @ speed of 110 KMPH is now getting ready to stop at station only few KMs ahead so how would the train stop?
If assuming that the loco had no train brakes & LP applied...
more... Loco brakes, will the train stop ? No.
Reason: The inertia of the rake will keep on pushing the loco ahead instead of stopping it resulting in coupling damage, damage to loco & in worst cases jumping of danger signal or moving into dead end.
So Train Brakes + Loco Brakes are available in every loco be it WAM4/WAP5/WAG7 etc.