Explaining the Train

When a driver gets into a train
he is its brain. The driver
conducts the train towards
its nutrient: the passengers.
Sometimes the passengers
like to be fed to the train.
Sometimes it's too much food
and a relief to be spewed up.
Sometimes the train is not hungry
and the passengers go stale.
This is called hunger strike.
Then the passengers remember
that the train has a brain.
They look at their stale hands
and sneak off home for a bath.