https://www.railwaygazette.com/vehicles/design-agency-showcases-post-covid-metro-train-concept/57294.article

Design company Tangerine has developed a concept for a ‘post-Covid’ metro
train, designed to help operators plan for future pandemics by enabling
them to readily adapt the interior to minimise the risk of transmission
during local outbreaks.

The ‘Metamorphosis’ concept has an adaptable interior which could be
optimised for high passenger occupancy during normal times, and then
quickly switched to support social distancing and changed behaviour when
required.

This includes slidable screens that can be deployed during pandemics to
divide the interior space into smaller zones, and flexible seating which
angles the passengers away from each other to increase privacy and minimise
the potential for for cross-contamination.

Other features are a localised air filtration system providing a constant
change of air, a touchless hand sanitation point in the vestibule and QR
codes to support a ‘track and trace’ system.

Traffic light style illumination around the doors would aid safe and
socially distanced boarding and alighting.