Boeing 787 test plane ZA001 (N787BA) recently conducted its first taxi tests at Paine Field. This is the first time the Boeing 787 has moved on a runway under its own power. The test pilots were checking the steering and braking system.
The Rolls Royce Trent 1000 just sounds great! Reminds me of the amazing GE90 
Video by daveaboyac
This video shows further testing, but is without sound, unfortunately:
A small whoops, maybe? I can’t seem to fin a working link to the actual video on either this page or the linked ‘videos’ page
FWIW
Used to see all kinds of activity going by on the 525 going to and from the Ferry Landing.
You can just feel how she wants to get airborne……