palanquin
輦 centers on a human-drawn wheeled conveyance: a palanquin or handcart used to carry people.
輦 combines 㚘 (two people) and 車 (vehicle), representing a cart drawn by people. This is a straightforward semantic compound.
Two people (㚘) pulling a cart (車) make a palanquin: a human-powered carriage.
For レン, imagine a long line of people pulling a palanquin, like a human-powered train: the train of people cues レン.