DCC friendly mechanism
Per-prototype paint variations on Bluebonnets: #325 lacks blue stripes under the lower headlight while #332 has the double stripe, just like the prototype.
A-unit LED has directional headlight and illuminated number boards
Locomotives have a powerful five pole motor with all wheel electrical pickup and blackened wheels
KATO magnetic knuckle couplers
Drop in DCC compatible with the Train Control Systems K0D8 series and Digitrax DN163K0B