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Although the poem's phrase 'the engine of her family' names the tree, it is really the goldfinch who powers the engine, and the poem depicts her as the source of all its life. Before she comes, the tree is 'silent, quite still', a few leaves yellowing, all its seeds fallen — nothing stirs. Her arrival is 'a suddenness, a startlement', and the moment she enters the thickness, 'a machine starts up / Of chitterings, and a tremor of wings, and trillings'; the whole tree trembles and thrills. The hidden fledglings, silent in her absence, erupt into hunger and noise at her coming, and she stokes the engine full — feeding them, sustaining them, running the family. Her careful, alert, lizard-like behaviour shows a provider conscious of danger to her brood. When she launches away towards the infinite, the machine stops and the laburnum subsides to empty. The bird, then, is the invisible heart of both tree and family: present, everything throbs; absent, everything stills.