上海申通地铁有限公司董事长俞光耀在昨晚的一长新闻发布会上称，发生故障的系统是由卡斯柯信号有限公司制造的。

The system that had the fault was made by Casco Signal Ltd., Shanghai Shentong Metro Co. Chairman Yu Guangyao said at a press conference yesterday evening.

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上海申通地铁总裁俞光耀通过官方微博向公众道歉，并表示示“这是上海地铁史上最黑暗一天”。

Thee subway operator, Shanghai Shentong Metro Group, apologized on its official micro blog for the accident, and described the day as the "darkest in Shanghai's subway history".

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