Assembly (32,42) for supporting an object (2,3) on a rail (31,41) whilst the object (2,3) moves along the rail (31,41), wherein the assembly (32,42) comprises a load bearing housing (32H,42H) for carrying the object (2,3), wherein the assembly (32,42) comprises an endless chain of steel cylindrical rollers (32R,42R), which are arranged for recirculating along a closed path (32P,42P) around a steel raceway member (32G,42G) and a steel central body (32B,42B) of the assembly (32,42) which central body is attached to or integral with the load bearing housing (32H,42H), the path (32P,42P) including - a work portion (32Pw,42Pw) defined by a flat load bearing surface (32L,42L) of the steel raceway member (32G,42G) of the assembly (32,42), in which work portion (32Pw,42Pw) an operative set of the cylindrical rollers (32R,42R) engages the rail (31,41) when the assembly is supporting an object on a rail, and - a return portion (32Pr,42Pr) defined by a return surface (32T,42T) of the steel central body (32B,42B) of the assembly (32,42) in which a remaining set of the cylindrical rollers (32R,42R) is free from the rail (31,41) when the assembly is supporting an object on a rail, e.g. the return portion having a section which is parallel to the work portion (32Pw,42Pw), wherein the assembly (32,42) comprises an elastically compressible resilient insert (32I,42I), e.g. containing a plastic material, which resilient insert is sandwiched between the steel central body (32B,42B) and the steel raceway member (32G,42G) above the work portion (32Pw,42Pw), so that the central body (32B,42B) is resiliently supported on the operative set of the cylindrical rollers (32R,42R) via the insert (32I,42I) and the steel raceway member (32G,42G). wherein the assembly (32,42) comprises an endless chain of steel cylindrical rollers (32R,42R), which are arranged for recirculating along a closed path (32P,42P) around a steel raceway member (32G,42G) and a steel central body (32B,42B) of the assembly (32,42) which central body is attached to or integral with the load bearing housing (32H,42H), the path (32P,42P) including - a work portion (32Pw,42Pw) defined by a flat load bearing surface (32L,42L) of the steel raceway member (32G,42G) of the assembly (32,42), in which work portion (32Pw,42Pw) an operative set of the cylindrical rollers (32R,42R) engages the rail (31,41) when the assembly is supporting an object on a rail, and - a return portion (32Pr,42Pr) defined by a return surface (32T,42T) of the steel central body (32B,42B) of the assembly (32,42) in which a remaining set of the cylindrical rollers (32R,42R) is free from the rail (31,41) when the assembly is supporting an object on a rail, e.g. the return portion having a section which is parallel to the work portion (32Pw,42Pw), - a work portion (32Pw,42Pw) defined by a flat load bearing surface (32L,42L) of the steel raceway member (32G,42G) of the assembly (32,42), in which work portion (32Pw,42Pw) an operative set of the cylindrical rollers (32R,42R) engages the rail (31,41) when the assembly is supporting an object on a rail, and - a return portion (32Pr,42Pr) defined by a return surface (32T,42T) of the steel central body (32B,42B) of the assembly (32,42) in which a remaining set of the cylindrical rollers (32R,42R) is free from the rail (31,41) when the assembly is supporting an object on a rail, e.g. the return portion having a section which is parallel to the work portion (32Pw,42Pw), wherein the assembly (32,42) comprises an elastically compressible resilient insert (32I,42I), e.g. containing a plastic material, which resilient insert is sandwiched between the steel central body (32B,42B) and the steel raceway member (32G,42G) above the work portion (32Pw,42Pw), so that the central body (32B,42B) is resiliently supported on the operative set of the cylindrical rollers (32R,42R) via the insert (32I,42I) and the steel raceway member (32G,42G).