IT's been a long time since the last merger between two North American Class 1 railways - the carving up of Conrail between CSX and Norfolk Southern in the late 1990s being the most recent example. But Canadian Pacific (CP), under the stewardship of its capable but controversial CEO Mr Hunter Harrison, goes into 2016 looking for a combination with another Class 1, and after failing to reach a deal with CSX at the end of 2015 has Norfolk Southern (NS) firmly in its sights.