For a number of random reasons we need a new F7 A and B unit for TS2012. The lovely task has been passed onto me, (that will teach me walk into the boss's office empty handed!)
Anyway, I scanned in the plans from my Big red Diesel book
I then set about nose section. The plan was to spline model the section as I had done for my new deltic but as I started it at the end of the day I just started pushing some shapes around to see how I would do.

Make a Sphere.
Scale the sphere in the z axis.
Scale the sphere in the x axis.
I then deleted three quarters of the sphere to leave me with a 'corner'. Using vertex soft selection I tweaked the profile of this corner from above and 2 sides to match the plans.

I then made a cylinder in the front view and deleted the unwanted polys, this I will use for the headlight.
derek