The Great L'Enfant Pileup (Part 2) -- The Unit Train

I have never seen L'Enfant Plaza this busy.
When we left off part 1, a northbound Amtrak pulled by two ALC-42s had parked itself on track 2. What the hell could it possibly be waiting for? How many trains are being held up behind it? Meanwhile, whatever it was the defect detector had reported on track 1 was nowhere to be seen. Will it ever show itself? And just how many axles does it have?
Find out now.
#railfanning #amtrak #washingtondc