Photo courtesy of Stewart Sterling

No. 666 in the Anchorage yard. 6-5-81.
P-6 booster unit (ex Amtrak 666, exx Amtrak 1916, rebuilt by ICG Paducah from Amtrak E9B 463, nee UP 963B, builder #20503). It was converted in 1975 and equipped with two steam generators. The railroad surplused it 2002.