Abstract: In a method of lubricating a curved section of a railway track subjected to wear by the wheel-flanges of passing railroad vehicles the rail section is intermittently lubricated with lubricant from a lubricating shot-unit or metering-unit provided with a nozzle. The shots of lubricant may be controlled by using a signal voltage applied between the rails or by means of an electric transducer, an inductive transducer, a coupling clock or the like. Compressed air and/or lubricant is applied through lines to the metering-unit from separate storage containers arranged at a distance from the unit.In one embodiment a propelling-gas of reduced pressure is caused, via a control unit, to control in a pulse-like fashion a metering valve associated with said metering-unit.The invention also refers to an apparatus for the intermittent discharge of a working substance, e.g. grease for lubricating railway tracks, by means of a propelling-gas under high pressure such as nitrogen gas.