Benson Falls, 91 km curve, an empty train blasts up the steep grade behind a General Electric built Dash 9-44CW unit 7072 serial 47751 leads two General Electric built ES44DCi units 8140 and 8158, 7072 is from the original delivery of Dash 9-44CW units in 1994 and is showing its age. 28th July 2017. GeoData.