The Mecklenburg T 7 engines were German, six-coupled, narrow gauge, steam locomotives with the Grand Duchy of Mecklenburg Friedrich-Franz Railway (Großherzoglich Mecklenburgische Friedrich-Franz-Eisenbahn).
They were employed on the Bäderbahn between Bad Doberan and Heiligendamm.
They replaced the existing vehicles after the line had been extended to 15.4 kilometres to Arendsee.
The design of these locomotives was heavily based on those of the Class T 3 from Prussia.
Later, two units went to the so-called Rübenbahn ('Turnip Railway'), the branch line from Tangermünde to Lüderitz.