I haven't been to every traghetto station in Venice, but most of the ones I have visited have a shrine. Some of them have both a Madonna housed in one of those green metal tabernacles on a pole in the canal and a regular shrine on dry-land too. This one is in San Polo, inside a sotoportego not far from the church of San Silvestro.
Another case of good timing....as I was admiring their shrine, three gondoliers came strolling down the way.
This shrine used to house an image of the Madonna Nikopeia, the much loved and revered icon in Basilica di San Marco. Today there's a statue of the Madonna and Child, hard to photograph because of the plexiglass protecting her.