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plural tubeplates
A plate across the barrel of a boiler, containing many small holes to receive the firetubes. quotations examples
Such soot blowers often have movable jets so that the jet can be directed towards different parts of the tubeplate in turn.
1944 May and June, “The Why and the Wherefore: Locomotive Soot Blowers”, in Railway Magazine, page 194
The smokebox tubeplate is of the drum-head type, and there are 21 large flue tubes, 5⅛ in. dia. outside, and 157 small tubes, 1¾ in. dia. outside; length between tubeplates is 13 ft.
1951 August, “British Railways Standard Class "4" 4-6-0 Locomotives”, in Railway Magazine, page 543