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comparative higher grade, superlative highest grade
Of high quality, particularly good. quotations examples
Were the possibilities of improving the efficiency of British Railways' steam locomotives by making the best use of the reasonably satisfactory low-grade lump coal available today, and thereby saving more high-grade locomotive coal, borne in mind when it was decided to go ahead rapidly with replacement of steam traction?
1961 September, “Talking of Trains: Greater scope for steam”, in Modern Railways, page 517
Strikes are now due to take place on [...], while conductors also remain under instruction not to work any rest days or to undertake any higher-grade duties until further notice.
2021 September 8, “Network News: RMT on "war footing" in response to workforce cutback threats”, in RAIL, number 939, page 15