Railway wagon for the storage, transportation and unloading of railway gravel and inert material, comprising a frame provided with wheels for advancing on the rails of a railway line, at least one container for the storage of the railway gravel or inert material, supported by said frame, said container having a lower portion in which at least one door for emptying is provided, and conveying means for moving the railway gravel or inert material from and towards said container, said conveying means comprising at least one lower conveyor positioned below said container and extending below said lower portion of said container essentially for the entire length thereof, and at least one upper conveyor positioned above said container, wherein said conveying means comprise at least one front conveyor communicating with said lower conveyor, said front conveyor being tiltable between at least two angular positions around a first articulation axis, driving means being provided at the first articulation axis that allow rotating said front conveyor, and at least one rear conveyor, communicating with said upper conveyor, tiltable between at least two angular positions around a second articulation axis, wherein said front conveyor comprises a first free end, and a second end articulated to the front end of said frame at said first articulation axis, the latter being perpendicular to the longitudinal axis of said frame, and wherein said front conveyor can be lengthened and said rear conveyor can be lengthened in a manner such to allow following different possibilities for working a flow of the railway gravel or inert material from a first of said railway wagon to a second of said railway wagon, said first and second wagon (1a, 1b) being adjacent: a passage of the railway gravel or inert material from the lower conveyor of said first wagon to the lower conveyor of said second wagon; or a passage of the railway gravel or inert material from the lower conveyor of said first wagon to the upper conveyor of said second wagon; or a passage of the railway gravel or inert material from the upper conveyor of said first wagon to the upper conveyor of said second wagon; or a passage of the railway gravel or inert material from the upper conveyor of said first wagon to the lower conveyor of said second wagon, whereby said rear conveyor and said front conveyor can be extended/retracted between a minimum length and a maximum length, to allow said passage of the railway gravel or inert material from the lower conveyor of said first wagon to the lower conveyor of said second wagon by tilting the front conveyor of said first wagon downward, and also extending it by a certain section such that its first end a is partially superimposed on the rear end of the lower conveyor of said second wagon, so that the transfer of the railway gravel or inert material can occur by falling. a passage of the railway gravel or inert material from the lower conveyor of said first wagon to the lower conveyor of said second wagon; or a passage of the railway gravel or inert material from the lower conveyor of said first wagon to the upper conveyor of said second wagon; or a passage of the railway gravel or inert material from the upper conveyor of said first wagon to the upper conveyor of said second wagon; or a passage of the railway gravel or inert material from the upper conveyor of said first wagon to the lower conveyor of said second wagon, whereby said rear conveyor and said front conveyor can be extended/retracted between a minimum length and a maximum length, to allow said passage of the railway gravel or inert material from the lower conveyor of said first wagon to the lower conveyor of said second wagon by tilting the front conveyor of said first wagon downward, and also extending it by a certain section such that its first end a is partially superimposed on the rear end of the lower conveyor of said second wagon, so that the transfer of the railway gravel or inert material can occur by falling.