ERA presents manual for Covid-safe train ventilation
Source: ERA
Keep individual ventilation closed, but turn on ventilation systems and use natural ventilation as much as possible to get harmful aerosols out of the train. These are some of the advice that the European Union Agency for Railways (ERA) collected in a Covid-19 information bulletin with technical advice on ventilation in railway vehicles.
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Almost a year later, many of these recommendations are still not complied with.
It is still a secret of train operators if or how much they increased fresh air supply. The resulting ear of infection is certainly one of the reasons why passengers were lost. The official regulations also skipped the aspect of air exchange, but rather focus on mask obligations.