Last time, I had it worst. I was heading towards Ampang Park on the Putra LRT during morning peak hour. During peak hours, the lrt goes a bit faster. Refer to picture.
I stood in the middle of the train, at the inter-carriage joining section. I was holding on to one bar and there was a gal behind me, leaning on the "wall". Suddenly, the entire train blacked out while in the underground tunnel. I could see nothing at all, not even my own hand. The aircond went off and there wasn't even the air cond sound at all. The train was free rolling in the tunnel, as if it was on neutral gear. After about 2-3 seconds, the emergency lights came on. Immediately, the brakes on the train locked and I could hear steel to steel screeching. I could feel myself started to slide back (I didn't let go of the handle bar) bit by bit. It was then obvious that the train was screeching with wheels locked, on the track. When the train came to a final halt, I swing lick a pendulum and sandwiched the gal into the wall with a loud CRASH. I couldn't do much cos I lost my balance already. I asked her if she was ok and she said that she was. The train, after some time, slowly moved to KLCC station and stopped there, and then moved on to ampang park where i got off. The underground train services were then stopped.