And there was no emergency lighting to show the quickest escape route, he added.

BBC: Could Brazil's club fire have been avoided?

Many reported stifling temperatures on board the stranded train, with toilets not working and staff struggling to find emergency lighting.

BBC: Delayed passengers arrive at St Pancras

These products are used in telecommunications networks, computer-controlled systems, security systems, emergency lighting, electric utilities and switchgear, medical equipment, rail signaling, renewable energy, and military and aviation equipment.

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"We need to know if the building fulfilled to the letter the rules determined by the Brazilian Association of Technical Standards (ABNT), for example, the existence of emergency lighting, " he added.

BBC: Could Brazil's club fire have been avoided?

Years of tests and deliberations ended in 2007 with the FAA certifying the use of the powerful lithium batteries on 787s a precedent-setting step for a jet to power key onboard systems, including flight controls, emergency lighting and cockpit recorders.

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About half an hour later, neighbouring Monklands Hospital was also hit by power cuts affecting lighting systems in the accident and emergency department.

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