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We study a one-dimensional mixture of active (run-and-tumble) particles andpassive (Brownian) particles, with single-file constraint, in a sawtoothpotential. The active particles experience a ratchet effect: this generates acurrent, which can push passive particles against an applied load. Theresulting system operates as an active engine. Using numerical simulations, weanalyse the efficiency of this engine, and we discuss how it can be optimised.Efficient operation occurs when the active particles self-organise into teams,which can push the passive ones against large loads by leveraging collectivebehaviour. We discuss how the particle arrangement, conserved under thesingle-file constraint, affects the engine efficiency. We also show thatrelaxing this constraint still allows the engine to operate effectively.

Active-passive mixtures with bulk loading: a minimal active engine in one dimension