How are these vinyl railings installed / removed?

Anyone know how these vinyl railings are installed or removed?! There are no visible screws.

I have to move about a cord of firewood up onto a deck, and I can either walk it up 8 stairs, or push a wheelbarrow up a hill to the other side of the railing.

I've been doing to stairs for 2 years, and it just dawned on me how easy it our be to rollfull wheelbarrows right up if I could easily get 1 section of railing off/on.