mixed consist
n.— «Trolley officials had intended to couple 11 new, streamlined trolley cars to older models during busy periods for the Old Town to Santee run that opened in July 2005.…Now the bugs have been worked out, and trolley officials expect to begin operating what is called “a mixed consist” around Thanksgiving.» —“3 on executive committee may all be gone after vote” by Jeff Ristine San Diego Union-Tribune (California) Oct. 22, 2006. (source: Double-Tongued Dictionary)
Further reading
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