steamchest

Noun

steam chest (plural steam chests)

1. A chamber in a steam engine or locomotive from which steam from the boiler is distributed to the cylinders.
   • One small tooth increase in regulator opening makes a minute increase in steam chest pressure reading and one can feel the clearly perceptible increase in the power output beneath one's feet.1961 March, 'Balmore', “Driving and firing modern French steam locomotives”, in Trains Illustrated, page 150

   Synonyms:

   steam dome