Top operating H tightlock coupler

A system comprising a type H tightlock coupler comprising a channel and an inner chamber, the channel running from a top side of the type H tightlock coupler to the inner chamber, and an anti-creep shelf disposed on an interior surface of the inner chamber, a plug comprising a first surface operable to contact the anti-creep shelf, the plug configured to fit at least partially within the channel, a link comprising a second surface operable to contact the anti-creep shelf and a hook, the link configured to fit at least partially within the channel, and a lock comprising a slot operable to receive the hook, the lock configured to fit at least partially within the inner chamber.