There are no details on the conversion, but if we assume that the cylinders were bored an additional 1", the tractive effort would have increased by about 10 percent. This is following Baldwin’s published formula for tractive effort (ref. 78). Boring out the cylinders would have required new pistons, of course. The weight of the unit would not have changed significantly. The steam capacity of the boiler would have been sufficient for the low speed operations of the Eckhart Branch. One of the limitations of the Eckhart Branch, besides the tunnel clearances, curves, and grade was the load capacity of the Wills Creek Bridge, at the West End of the Narrows.