I have been on excursions behind its little cousin, 3985 a 4-6-6-4, a number of times. I think I heard somewhere that to speed up the restoration project they borrowed the near identical tender off of the 3985 to get the 4014 up and running as soon as possible. The tender caries the water and fuel, in this case recycled motor oil. The 4014 was converted to burn oil instead of coal during its restoration.