Block in and Basic Shapes - Part II

After I finished the 1st pass for the carriage section I started to work on the engine sections. Again it was a big iteration process to come up with the details, and continue to add more detail pass after pass.Most of the shapes are there in a very basic shape and non of the small details have been added, at this moment I'm mostly concerned with the balance of positive and negative space as well as the flow of the lines. I'm still not very happy with the lines of the panels in the rear on of the engine but I will continue to iterate on that.