Abstract: A ladder platform and safety rail device is provided for mounting on one or more ladders and includes a U-shaped bracket with an insert leg for extending through a hollow ladder rung. The bracket also includes a rail leg, which is releasably connected to a rail. The bracket legs extend through a bracket leg plate, which secures their ends together with the device mounted on one or more ladders. A working deck is formed by a plank supported on a ladder jack attached to each ladder. A rail support strut extends between the rail and the plank.