Stand Behind the Yellow Line!!

I travel to work most days on public transport. that involves trains and the underground in London. Frankly its a bummer of a journey which because it is some 80 miles each way and takes over 2 hours both adds a lot to my working day and is fraught with opportunities for the train companies to screw you over at any one of dozens of places on route 

Now, on the tubes in London, the platforms are often crowded and to minimise the possibility of falling onto electric lines they paint a yellow line about 18 inches from the edge of the platform and continuously via the public address systems extoll the virtues of "standing behind the line"

"...For your own safety please keep well behind the yellow line, the train is approaching. Keep behind the yellow line for your own safety..."  and so on, ad nauseum. 

Now, certainly at night , and even in the day times, the underground system in London is not always a safe place to be: there are pickpockets, and muggers and all sorts there. So, I was dutifully standing behind the yellow line the other day when it struck me: just WHAT does "stand behind the line" mean? Now, i can be safe from electrocution by standing on the platform side of the line, but, I may get mugged or pickpocketed. So, what if i stand the other side? I am still technically "behind" the line just from a different perspective. So, If i stand teetering on the edge of the platform "behind the yellow line" would I be safe from pickpockets and muggers because they wont cross the line? 

Question is, I think i may opt to stay trackside, because i reckon a damn more people get mugged and robbed in london each day than get killed falling on tube train lines.