Open Platform

What is the fine for smoking on a platform that is open at a trainstation?

I was recently waiting for a train and had a cigarette on the platform whilst waiting as I was unaware it was illegal, until i put it out and noticed the sign. It was an open area with no one around me. Im very worried i will receive a fine as there were cameras around. How much would the fine be?

It all depends on where you live. But just because they have cameras, that doesn't mean they know your name or address unless you had it stamped across your forehead.