Hey so the speed of light is same for everyone?Isn't it.

I have read about that thing where you are in a train that is travelling at nearly the speed of light and so you must not be able to see the back of the carriage but you will be able to see it as the speed of light same for everybody.
So what is the logic behind it I mean explain it to me how the speed of light will be same.
You have no limits in explaining but please try to give examples and explain thoroughly.

Normally, if you were on a train travelling 100 miles an hour, and shot a gun towards the front of the train at 1,000 miles per hour, the bullet would travel at 1,100 mph. You could simply add the speeds together.

You can't do with is light. The speed of light is a constant. So the light that is reflected from the back of the train is moving towards the front of the train at the same speed as the train (assuming the train could go the speed of light). The light would simply be pacing the train at the same speed.

If you shone the light out of the back of the train, the light wouldn't just simply stop in space. It would speed away from the back of the train at the speed of light as the train moved away from you at the speed of light.

Boggles the mind, doesn't it?

eh? it's just the same.

The speed of light in a vacuum remains the same no matter what the source or observer are, or what they are doing.

That's a fact borne out by the Michelson-Morley experiments in the late 1800s. So, putting it in math terms, the relative speed W = C + V = C when the observer is approaching the source of light and W = C - V = C when the observer is going away from the light; where C is the speed of light and V is the speed of the observer.

Classical physics says the two vectors (C and V) should be additive, but with light they aren't. They add up to C each time. Why is that? And that's what A. Einstein set out to find out... and he did, it's called the special theory of relativity (STOR).