Producing a profit.
Profitable operation is being made possible by the widespread introduction of capacious diesel railcars, which for their comfort and speed are very popular with the travelling public.
Beneficial, serviceable, of use.
I wylbe ferme and ſtabyll And to yow ſeruyceabyll And also prophytabyll Yf ye be agreabyll My propyr Beſſe To turne a gayne to me
From Old French profitable, equivalent to profit + -able.
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