A rail mounted table device for securing onto a rail and placing objects thereon. The rail mounted table device includes a planar member having an upper surface and a lower surface, wherein a pair of protrusions extend perpendicularly from the lower surface of thereof. The protrusions define a channel in order to accept a horizontal rail therebetween, allowing the lower surface of the planar member to rest flush against the upper surface of a rail. The protrusions are preferably rectangular, wherein the first protrusion is parallel to the second protrusion. In this way, the rail mounted table device is removably securable to a rail. In an alternative embodiment, each protrusion is L-shaped so as to fit over a corner of a rail. The upper surface of the planar member provides an area for users to rest objects thereon, such as food and drinks.