Railway vehicle for moving material, optionally gravel, comprising at least one first and one second railway wagons (1, 50), each of said first and second railway wagons (1, 50) extending longitudinally between a first and a second longitudinal end portions (2, 3), wherein said first and second railway wagons (1, 50) are engaged with each other at the second longitudinal end portion of the first railway wagon and at the first longitudinal end portion of the second railway wagon, wherein each of said first and second railway wagons (1, 50) comprises: - at least one platform, - at least one carriage configured to support the platform and allow the movement of the railway wagon along rails, - at least one conveyor carried by the platform and having an operating section (To) configured to receive the material, the conveyor being configured to move the material relative to the platform at least along a advancement direction between the first and second longitudinal end portions (2, 3) of the railway wagon, wherein the railway vehicle comprises at least one connection device carried by at least one of said first and second railway wagons (1, 50) and configured to define an intermediate section (Ti) of connection of the operating sections (To) of the conveyors of the first and second railway wagons (1, 50), wherein the connection device comprises: - at least one first support element extending as an extension of the operating section (To) of the conveyor of the first wagon, approaching the conveyor of the second wagon, - at least one second support element extending as an extension of the operating section (To) of the conveyor of the second wagon, approaching the conveyor of the first wagon, characterized by the fact that the connection device comprises at least one auxiliary support element facing the first support element, with respect to a direction orthogonal to the platform, wherein the auxiliary support element defines, in cooperation with the first support element, a guide adapted to receive the second support element. wherein each of said first and second railway wagons (1, 50) comprises: - at least one platform, - at least one carriage configured to support the platform and allow the movement of the railway wagon along rails, - at least one conveyor carried by the platform and having an operating section (To) configured to receive the material, the conveyor being configured to move the material relative to the platform at least along a advancement direction between the first and second longitudinal end portions (2, 3) of the railway wagon, - at least one platform, - at least one carriage configured to support the platform and allow the movement of the railway wagon along rails, - at least one conveyor carried by the platform and having an operating section (To) configured to receive the material, the conveyor being configured to move the material relative to the platform at least along a advancement direction between the first and second longitudinal end portions (2, 3) of the railway wagon, wherein the railway vehicle comprises at least one connection device carried by at least one of said first and second railway wagons (1, 50) and configured to define an intermediate section (Ti) of connection of the operating sections (To) of the conveyors of the first and second railway wagons (1, 50), wherein the connection device comprises: - at least one first support element extending as an extension of the operating section (To) of the conveyor of the first wagon, approaching the conveyor of the second wagon, - at least one second support element extending as an extension of the operating section (To) of the conveyor of the second wagon, approaching the conveyor of the first wagon, - at least one first support element extending as an extension of the operating section (To) of the conveyor of the first wagon, approaching the conveyor of the second wagon, - at least one second support element extending as an extension of the operating section (To) of the conveyor of the second wagon, approaching the conveyor of the first wagon, characterized by the fact that the connection device comprises at least one auxiliary support element facing the first support element, with respect to a direction orthogonal to the platform, wherein the auxiliary support element defines, in cooperation with the first support element, a guide adapted to receive the second support element.