How would you explain this sentence?
For a son on the wrong track, Mother has found a different set of rails and packed him off on them. Lock, stock, and barrel, she said with a raised glass. Describing a firearm in its entirety.
This train runs north from the city. At the little struggling desert towns, children run alongside, reaching toward the windows. Then come the rocky flatlands where the towns give up altogether. Spiked maguey plants reach out of the ground like hands. A great clawed creature trapped underground. At evening, the light drained and the land went from brown to umber, then dried blood, then ink. In the morning the pigments reversed, the same colors rising out of a broad, flat land that looks like a mural.
How would you explain the last sentence in the first passage: Describing a firearm in its entirety?