Originally Posted by Firewood:
I think the terms are totally interchangeable, but "clockwork" is more on the British side, and "wind-up" could be more North American. The term "spring drive" seems to pop up occasionally.
Firewood is right about "Clockwork" being prevalent on the other side of the Atlantic and "Windup" being used here in the states, not to mention that Americans like to use "clockwork" and "windup" interchangeably. It's been my observation that "Clockwork" gives the connotation of a quality mechanism for the discriminating enthusiast, whereas "windup" gives the connotation of a child's toy. However, there really isn't any hard-and-fast rule; I don't mind mixing and matching terms. Let's face it, "Clockwork", "Windup", "Spring Drive" and "Mechanical" all differentiate a train that is driven by energy stored in a spring from a train that is driven by an electric motor. Glancing through some vintage advertisements, the British call them "Clockwork", but in America the terms "Clockwork", "Wind-up" and "Mechanical" are used by various domestic manufacturers.
I do tend to refer to my trains with machined gears as "Clockwork", and the trains with cheaper stamped steel gears as "Windup", but I'm pretty flexible on that. Let's face it, none of them have 17 jewel movements in them...