Seven cars that fell into the water contained molten sulfur and hot asphalt, local authorities have said

当地当局表示，掉进水中的七节车厢装载着熔化硫和热沥青。
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A train carrying potentially hazardous materials has derailed in the US State of Montana, with several cars ending up in the water, authorities said on Saturday. Montana Rail lix, the company operating the train, said there were no injuries.
In a statement on Facebook, Stillwater County’s Disaster and Emergency Services Department (DES) said the incident occurred at about 6am local time on a bridge over the Yellowstone River, which collapsed. In total, three cars containing hot asphalt and four cars carrying molten sulfur crashed into the water, it added.
The department said the cause of the incident remains unclear, and declined to speculate on whether the bridge collapse had led to the derailment, or vice versa.
Meanwhile, Montana Rail lix said the train also included two cars with sodium hydrosulfate, an extremely corrosive substance, but that neither of those made contact with the water.

当地时间周六，一列运载潜在危险物质的火车在美国蒙大拿州出轨，几节车厢掉进水中，当局表示没有人员受伤。Stillwater县灾难和紧急服务部（DES）在Facebook上发表声明称，该事件发生在上午6点左右，一座位于黄石河上的桥梁坍塌。据称，总共有三节装载热沥青的车厢和四节装载熔化硫的车厢坠入水中。该部门表示，事故原因尚不清楚，并拒绝推测是桥梁坍塌导致了出轨，还是出轨导致了桥梁坍塌。与此同时，蒙大拿铁路公司表示，火车还包括两节装载极易腐蚀的硫酸氢钠的车厢，但这两节车厢都没有接触到水。

It stated that “initial air quality assessments have been performed and confirmed that there is no release event associated with those two cars.”
The DES noted that there is “no expected HAZMAT [hazardous materials] impact to Stillwater County towns,” adding that air and water monitoring efforts in the area are continuing.
Despite the reassuring statements, local authorities have asked people in the area to conserve water, explaining that water treatment facilities “have instituted emergency protective measures… due to a potential hazmat spill.”
The Montana derailment comes after several similar incidents across the US, including one in Ohio in early February. At the time, the Norfolk Southern-operated train, which was carrying toxic chemicals and combustible materials, went off track and caught fire in the village of East Palestine, prompting a mass evacuation in the area.
Later, officials decided to carry out a controlled burn on site to prevent an explosion, which triggered fears of severe environmental contamination in nearby towns.

声明中指出，“已经进行了初步的空气质量评估，并确认这两节车厢没有发生泄漏事件。”
DES指出，“预计不会对Stillwater县的城镇造成危险物质的影响”，并补充说，该地区的空气和水资源监测工作仍在继续。尽管有这些安抚性的声明，当地当局还是要求该地区的居民节约用水，解释称水处理设施“已采取紧急保护措施...由于潜在的危险物质溢出事件”。在蒙大拿州发生此次出轨事故之前，美国发生了几起类似的事件，包括今年2月初在俄亥俄州发生的一起事故。当时，由Norfolk Southern公司运营的火车运载着有毒化学品和易燃材料，脱轨并在东巴勒斯汀村着火，导致该地区大规模疏散。随后，官员决定在现场进行控制性燃烧，以防止爆炸，这引发了人们对附近城镇严重环境污染的担忧。