If I may add, the B747 is also certified for initiating a take off with an engine out. This is a special procedure that is sometimes performed by different operators.
This obviously is for positioning the aircraft where repairs could be made, i.e. NO Revenue flt.
This is a special AFM chapter, special inspections, procedures, limitations and training...
And it dates back to the DC-6. I believe almost all 3- and 4-engine transports have this certification, although the operator may have to pay extra for the rights.