A beam delivery system including a shield which includes at least one beam passage for transmission of at least one laser beam; an optics assembly configured to at least partly focus the at least one laser beam on the at least one beam passage; and means for providing a fluid flow through the at least one beam passage. Also provided is a train and a transport system, as well as a beam delivery method that includes: transmitting at least one laser beam through a respective at least one beam passage of a shield; at least partly focusing the at least one laser beam on the at least one beam passage; and providing a fluid flow through the at least one beam passage.