A battery fire on a train is not “just another small fire.” When a lithium-ion battery in an e-scooter or e-bike fails, the rail car can behave like a long pipe that moves smoke fast, limits escape options, and compresses decision-making into minutes.

We sit down with Adam Barowy from UL Research Institutes FSRI to unpack new full-scale passenger rail car burn tests using real micro-mobility devices and realistic storage locations. We talk through what thermal runaway looks like before flames, why that venting phase is a crucial warning sign, and what changes once flaming ignition starts. Adam shares the data that surprised even seasoned fire researchers: smoke can spread from one end of the car to the other in about 30 seconds after flaming ignition, floor-level visibility can collapse in roughly two to three minutes, and toxic exposure can become a serious egress limiter on the same timescale as train stopping and evacuation.

We also zoom out to the operational and societal reality. Rail operators want to support first mile last mile travel and riders who depend on e-mobility for work, yet they need policies that actually reduce risk. We cover practical options like limiting device size, avoiding carriage in the first or last car when exits are constrained, improving passenger education, requiring battery safety certifications, and exploring segregation strategies that keep devices away from passengers without pushing the problem underground.

I promised you links, so here they are:

• Summary of the research on trains and batteries 
• The full report 
• Li-Ion battery safety guide 

Cover image created from pictures from their report linked above! Following Adam's recommendation and taking your resources for a creative spin :)

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