Which term describes a unit or combination of units propelled by energy and operated from a single control?

• A. Fixed Signal
• B. Foul Time
• C. General Order
• D. Engine (Eng)

Answer: (D)

The term describes a powered unit or group of units that are propelled by energy and controlled from one control. In railroad terminology, an engine (often abbreviated Eng) refers to a locomotive or a locomotive consist that can be operated from a single control stand, whether it’s one locomotive or several coupled and controlled together. This is why it’s the correct choice.

The other terms refer to things that aren’t powered units. A fixed signal is a signal indicating permission or restriction at a location. Foul time is a timetable or operational constraint related to track occupancy. A General Order is a broad instruction affecting procedures, not a powered unit.