After announcing a strong quarter in May that highlighted sales growth and improved financial results, it looks like Westport Innovations is finally beginning to hit its stride on the back of accelerating adoption of natural gas engines for heavy trucking. 

In the short video below, Motley Fool contributor Jason Hall highlights three specific areas he's paying close attention to in coming quarters. While seeing the company improve on an adjusted EBITDA level is good, it's more important to understand how the company will get there. Additionally, Jason talks about how partners like engine maker Cummins, Inc and PACCAR Inc are important to understanding how Westport is doing. For more, check out the video below.