At time T2, {HEAD ~ the engine} begins to rotate under {TAIL ~ its own power} and cranking ceases 
begins to rotate under
At time T2 , { HEAD ~ the engine } begins to rotate under { TAIL ~ its own power } and cranking ceases
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH