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plural firebars
Any of the metal bars that form the base of a boiler's furnace and support the fire. quotations examples
On April 18 S.R. Pacific No. 34038 (71A) headed a Bournville excursion from Salisbury to Bristol but was detained at St. Philips Marsh shed on arrival with collapsed firebars and was still there at the end of the month; [...].
1963 June, “Motive Power Miscellany: Western Region”, in Modern Railways, page 423