Je was op zoek naar: spring rail (Engels - Italiaans)

spring rail fastening
attacco elastico

rail
guida

rail:
binario:

air springs for rail vehicles
sospensioni pneumatiche per veicoli ferroviari

air springs are used as suspension parts in commercial vehicles, cars and rail vehicles.
le sospensioni pneumatiche vengono impiegate nei veicoli commerciali, nelle autovetture e nei veicoli ferroviari.

rails
rallidi