This from Karl Klotz:

Thornton Engine Co 777
2012 Pierce Arrow XT 1250/750
This replaced Squad 722 and Engine 740.
Thornton Fire Department

New Engine 777 in Thornton is a 2012 Pierce Arrow XT with a 1,250-GPM pump and 750 gallons of water. Karl Klotz photo

This engine was posted previously HERE.