Here's a mix of stuff in a Mantua box.  The engine and coal car are attached, but I do not know if they are functional.  As you can see, there are several other pieces, parts and accessories included in the box.  If you need better pics of anything,  please ask. Please refer to the pics for condition.   I am not a train guy, but would say everything is between fair and rough condition.  On the good side, it does have a "replacement parts list" inside...🙂