I don't know the absolute net trend from 2012 until now. CP went through an unprecedented change in our operating model, with precision schedule railroading. You can't compare how CP was operating back then to how we're operating now. We've made vast improvements in our efficiency and effectiveness. In the last couple of years we had a period of declining demand, and as it has been rebounding, we have been adding back locomotives in a fairly significant way over the last couple of years.
On March 19th, 2018. See this statement in context.