A rail wagon for rail-and-road combined transport and for loading and unloading a road load, said wagon comprising: • two end platforms interconnected by a tie and equipped with bogies, the tie being connected to each end platform via a connection member; • a pivotally mounted structure that bears the road load and that is situated above the tie between the two end platforms, which structure is mounted to pivot between a transport position and a loading/unloading position; • a connection system provided at each end of the pivotally mounted structure and at the facing end of a respective one of the two end platforms for the purpose of detachably assembling the pivotally mounted structure with said end platform; each connection system comprising: • a pair of upwardly open hooks situated at the top portion on the facing end of the end platform; • a pair of downwardly open hooks situated at the top portion on the pivotably mounted structure, said downwardly open hooks engaging with and resting on the upwardly open hooks of said end platform when the pivotably mounted structure is in the transport position; characterized in that each connection system further comprises: • a pair of abutment pieces situated at the bottom portion of the facing end of said end platform and projectingly extending towards the pivotally mounted structure, said abutment pieces maintaining a fixed spacing between said end platform and said pivotally mounted structure when the pivotally mounted structure is in the transport position; • a centering device that guides the pivotally mounted structure when it arrives in the transport position and aligns it in the transport position with said end platform along a longitudinal axis of the rail wagon; and • a safety device that connects the pivotally mounted structure to said end platform and transmits traction forces between these two elements when the pivotally mounted structure is in the transport position and in the event that one of the connection members fails, said safety device having functional mechanical clearance between the end platform and the tie in nominal mode. • two end platforms interconnected by a tie and equipped with bogies, the tie being connected to each end platform via a connection member; • a pivotally mounted structure that bears the road load and that is situated above the tie between the two end platforms, which structure is mounted to pivot between a transport position and a loading/unloading position; • a connection system provided at each end of the pivotally mounted structure and at the facing end of a respective one of the two end platforms for the purpose of detachably assembling the pivotally mounted structure with said end platform; • a pair of upwardly open hooks situated at the top portion on the facing end of the end platform; • a pair of downwardly open hooks situated at the top portion on the pivotably mounted structure, said downwardly open hooks engaging with and resting on the upwardly open hooks of said end platform when the pivotably mounted structure is in the transport position; • a pair of abutment pieces situated at the bottom portion of the facing end of said end platform and projectingly extending towards the pivotally mounted structure, said abutment pieces maintaining a fixed spacing between said end platform and said pivotally mounted structure when the pivotally mounted structure is in the transport position; • a centering device that guides the pivotally mounted structure when it arrives in the transport position and aligns it in the transport position with said end platform along a longitudinal axis of the rail wagon; and • a safety device that connects the pivotally mounted structure to said end platform and transmits traction forces between these two elements when the pivotally mounted structure is in the transport position and in the event that one of the connection members fails, said safety device having functional mechanical clearance between the end platform and the tie in nominal mode.