firehole

plural fireholes

1. rail transportAn opening fitted with a door, giving access to the firebox of a steam locomotive, through which coal can be shovelled and the fire tended.

   A rolling grate in two sections is fitted; there are two injectors and an A.C.F.I. pump, and the usual firehole door.

   1961 March, 'Balmore', “Driving and firing modern French steam locomotives”, in Trains Illustrated, page 150

   1 more example

   The way the glare from our engine firehole pulsated, reflecting continuously in the steam, combined with our achievement in keeping level with the lighter train until our metals parted at Wilton, provided another lasting memory.

   1955 April, W. J. Alcock, “Unforgettable Moments”, in Railway Magazine, page 271