rail (36), preferably two rails, of a railway track (38), the method comprising: 

-providing,on the track (38),a train (40)accord- ing to claim 13; and 

- performing a beam delivery method that in- cludes: 

wherein the at leastone laser beam (8) is preferably directed at the at least one rail (36), in particular at a running surface (34) of said rail (36), wherein pref- erably the methodfurthercomprises removing liquid, e.g. rain water, from the at least one rail (36), in par- ticular from the running surface (34) of said rail (36), by a flow of gas, e.g. air. 

16. Beam delivery method, comprising: 

-transmitting atleastone laserbeam(8)through a respective at least one beam passage (6) of a shield (4); 

- at least partly focusing the at least one laser beam (8) on the at least one beam passage (6); and 

- providing a fluid flow (F) through the at least one beam passage (6), 

wherein the method preferably further comprises performing laserablation usingthe atleastone laser beam. 

45 17. Method of operating a train service, wherein t he method comprises: 

- providing a transport system (44) according to claim 14; and 

- preforming a method according to claim 15 for treating at least one rail (36) of a railway track (38) of the transport system (44). 

* transmitting at least one laser beam (8) through a respective atleastone beampas- sage (6) of a shield (4); 

* at least partly focusing the at least one laser beam (8) on the at least one beam passage (6); and 

* providing a fluid flow (F) through the at least one beam passage (6), 

*wherein the beam deliverymethod prefer- ably further comprises performing laserab- lation using the at least one laser beam; 

