As well as having a propensity to fail at inconvenient moments, the sea-lock at Glasson Dock is notable for one other thing: it's one of only a very few canal locks that are spanned by a bridge.
The bridge is fairly substantial: the road it carries is a bus route and road traffic is controlled by traffic lights. (Those are the bottom gates of the lock by the way).
There's another of these bridge/lock combinations on the soon to be re-opened Droitwich Junction Canal, where it joins the River Salwarp, although this is only a footbridge.
There's a third, much grander affair on the New Junction Canal at Sykehouse lock, where the bridge and lock mechanisms are controlled by the same automated programme and where I once set the very lengthy operating procedure irrevocably in motion seconds before a vehicle appeared wishing to cross.
Can anyone think of any other examples?