A sand gritting system for a railway vehicle has a vertical hopper with a tapering bottom end (2) to duct sand to a pneumatic dosing valve to a Venturi valve (7) to mix into a vertically downwards directed air stream. The sand is ducted into a mixing chamb...

Compressed air-driven sand-distributing device (10) comprises a sand container (14), a compressed air source (12), a sand intake chamber (36), and a nozzle (20). The nozzle has an air inlet, an ejection channel (26) and a sand intake opening (28). The sand...