Question: Was the Edison Sault Power Canal built after the Allegheny Portage Railroad discontinued operating?
Sentence (from "Allegheny Portage Railroad"): The roadbed of the railroad did not incline monotonically upwards, but rose in relatively long, saw-toothed stretches of slightly-sloped flat terrain suitable to animal powered towing, alternating with steep cable railway inclined planes using static steam engine powered windlasses, similar to mechanisms of modern ski lifts.
Relevant evidence: No