 The highway gradually straightens to a north – south alignment as it crosses Highway 58A and a set of railway tracks , both of which travel beneath the nearby Welland Canal to the west . Continuing north , Highway 140 passes over Lyons Creek , which meanders northeast to converge with the Welland River west of the Niagara River . The highway ends approximately 1 kilometre ( 0 @.@ 62 mi ) north of this point at an intersection with Main Street ( Niagara Regional Road 27 ) . Main Street travels beneath the Welland Canal immediately west of Highway 140 , providing a connection to Highway 406 on the opposite side . Because of its importance as both a through route past the canal and in linking Highway 140 with Highway 406 , East Main Street between Highways 140 and 406 is maintained the Ministry of Transportation of Ontario ( MTO ) as Highway 7146 . 
