different between grayline vs trayline

English

grayline (uncountable)

tray +? line

trayline (plural traylines)

A system of food preparation, used in hospitals, in which trays move along an assembly line.
- 1970, American Hospital Association, Hospitals: the journal of the American Hospital Association: Volume 44
  The trays for the test unit at first were assembled on a separate 'trayline within the main kitchen; however, this process consumed excessive space and time, so the operation was transferred to the regular trayline.

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