Reply to "Big Boy #4014 moves under power for the first time in over 50 years • The UP is bringing out the 4014, see schedule 🚂"

Dominic Mazoch posted:

I thought the late 4-8-4, late 4-6-6-4, and 4-8-8-4's were spec'ed by UP and ALCO to use common parts where possible?  Guess a tender is a "part"?  And were not all three classes coal burners as built from ALCO?

Guess they are using the MU box from 3985 also?

The UP had/has only one "Diesel MU Box", and simply moved it from 844 to 3985 and back, as needed.