Motor Duty Rating

Generally, the duty of the motor should be continuously

You answered your own question:

The duty of the "motor for Transfer car for handling Ladles for ladle Furnace" is to "Transfer car for handling Ladles for ladle Furnace".

(Make's one wonder how these guys can be such successful terrorists?)

In the rest of the world (i.e. not here in North America), they do not use the term Service Factor or Duty Cycle the same way we do.

IEC motors have what are called Duty Cycle Ratings, a numbering system that goes from S1 through S8 and are specifically spelled out in an IEC documnet. Here is a brief overview. IEC Duty Cycle Ratings