It is 7/8 x 2-1/2 2

Trainz Product Id: 11553621

Trainz Product Id: 11394566

The Trainz SKU for this item is P11557349

Trainz Product Id: 12478237

MTH 20-20178-1 Southern SD24 Diesel Engine w/Proto-Sound 3.0 #6316 ProductID_12177066 It is 7/8 x 2-1/2This is an MTH 20 20178 1 Southern SD24 Diesel Engine w Proto Sound 3. 0 #6316. GM's Electro Motive Division took a great technological stride forward with the introduction of the turbocharged SD24. In turbocharged engines, exhaust gases are used to power a turbine that increases cylinder air pressure, thus effectively increasing horsepower. In fact, the 16 cylinder model 567 diesel that produced 1800 horsepower in the normally aspirated SD18