- Union Pacific labeled their 2-10-2s with TTT to designate the wheel configuration. These powerful locomotives were ideal for hauling heavy tonnage. UP's TTT-6 and 7 were the last and the largest of the class. The TTTs received many modifications through their careers and served until the mid 50s.
- Based on the later, modified TTTs, this brass-hybrid model is DC/DCC sound equipped and features a five-pole can motor with skew wound armature and flywheel, full cab detail, nickel silver rods and valve gear, prototypical light operation with golden-white LED headlight and scale operating Kadee(R) couplers.
