Mechanical Engineers deal with the mechanical workings of systems. Some of the projects Mechanical Engineers are involved in concern; engines, boilers, heating and cooling systems, and various heavy equipment design. A mechanical engineer is interested in just about any object with a mechanism.  

A mechanical forensic engineer deals with the failure of any mechanical device.  Here is an example.  This is the report from the 51st Street Crane Investigation in New York City.

For more information on Mechanical Engineers go to http://www.asme.org/.