Passenger Trains > Strange consist in Wash Union Term this morning

Date: 04/22/15 12:28
Strange consist in Wash Union Term this morning
Author: joemvcnj

Cab car 9644 (pointed north)
Horizon coach 54508 (with fresh paint, and portion of lower side where it narrows is black)
NE Regional Dinette

What is it ? My guess is a test consist for ACS locos.