"The train slowed down abruptly, the lights went off, and then there was a spark of fire and smoke. We were blocked in," one passenger told Russian TV.

一名乘客对俄罗斯电视台说：“列车突然减速，灯灭了，然后是火花和烟雾，我们被堵在车里了。”

youdao

The train appeared, smoke billowing from the funnel of the engine.

火车开来了，车头的烟囱里冒出滚滚浓烟。

youdao

Lao Wan to go to Beijing to see his son, he bought a hard seat ticket, on the train without a seat, turn a few carriages, into a soft seat car found a seat, comfortable to smoke.

老万去北京看儿子，他买了一张硬座票，上车没有座位，转了几节车厢后，进了软座车厢找到个座位坐下，舒服舒服抽起烟来。

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"We could hear all the sirens and you could smell the smoke as the train went past the site, " he said in a submission to CNN's iReport.

CNN: 2 killed as helicopter crashes into crane in central London

The danger was compounded by an overhead power cable, which broke loose and fell on the roof of the rear car, causing further arcing and a large amount of smoke inside the train.

BBC: Metro train fire

And the lights went off and smoke started filling the train car.

CNN: Six killed in Washington-area Metro train collision