Aluminum honeycomb: a designable core for rail transit’s shift from welding/riveting to structural bonding Rail vehicle manufacturing is accelerating its transition from welded and riveted assembly to structural bonding, driving increased use of aluminum honeycomb sandwich panels in car bodies, driver’s cabs, interior systems and floor structures. The honeycomb core’s role is migrating from non-load-bearing interior trim toward semi-structural or load-transferring components, raising requirements for flatness, areal-weight consistency and bonding compatibility with skins. PASIA’s aluminum honeycomb floor and bulkhead panels are built on 3003/5052 aluminum foil, stretch-formed and bonded with epoxy or PU adhesive into sandwich structures. A typical 20 mm floor panel carries a theoretical areal weight of approximately 5.75 kg/m², delivering high rigidity at a fraction of the mass of equivalent solid aluminum construction. Surfaces can be supplied with anti-slip tread patterns for train and subway compartment floors and passageways, with moisture resistance, corrosion resistance and weathering performance matched to long-duty rail service conditions. PASIA aluminum honeycomb cores are further customizable in cell size and core density to provide predictable compression and shear behavior within structural bonding systems.