In other words, all "multiple units" employ some variation of multiple-unit train control. In the broader context, "unit" means any powered rail vehicle, including locomotives (that do not carry cargo) and powered cargo-carrying carriages. In the context of this article, "unit" refers specifically to the latter only (whether the cargo is passengers or some other cargo).

What follows is that if coupled to another multiple unit, all MUs can still be controlled by the single driver, with multiple-unit train control.