Saw that N956 this morning, but didn't see any helpers on it. BNSF 9806 & 5729 leading and an EOT bringing up the rear.
From what I heard, the five blocks are Plaster (1 & 2), Pleasant (1 & 2), Seymour, Fox and Alto. During the afternoon, every signal from Breton to Clarksville had a maintainer at it doing tests.