7 [ Rail road track maintenance machines, namely, ballast cleaning machines, ballast distributing and profiling machines, ballast stabilizing and consolidating machines, track moveable machines for handling ballast, machines for track renewal, machines for renewal of catenary, track grinding machines; rail track building machines, namely, machines for track laying, machines for track welding, machines for installation of catenary; machines for measuring rail track geometry, namely, machines equipped with measuring and recording devices for measuring the track geometry; rail track tamping machines, namely, machines equipped with tamping units for tamping ballast of rail road beds; tamping units and tamping tines for rail track tamping machines for the tamping of rail track ballast beds, ] air filters for motors [, engines ] and air cleaners; [ injection pumps, injection nozzles, fuel filters, ] oil filters, all aforementioned goods for engines excluding those for land and air vehicles; rolling bearings, slide bearings, shafts, shaft seals, [ gear wheels, ] drive wheels, gears, springs, filters, pumps, speed governors, pressure relief valves, [ oil coolers, ] brakes, hydraulic pumps, hydraulic cylinders, [ hydraulic reservoirs, ] hydraulic filters, hydraulic pipes all being parts of machines; hydraulic motors, hydraulic valves, [ power boosters for hydraulic transmission gears, ] all aforementioned goods for machines; motors [ and engines ] except for land vehicles, connecting shafts for machines; hydraulic pumps and hydraulic motors and components thereof; control valves and brake valves for machines; [ air compressors, compressed air reservoirs, ] compressed air machines, namely, compressed air cylinders [ and compressed air motors; ballast conveyors, ballast excavators, parts of the aforementioned goods ]