Hey there,

As I am a hands-on person and I think that knowledge needs to be shared, I attach a quick proposal that could work for you as initial shape.
You need accurate measures so the part fits, but I modelled this in less than 10 mins, just to show it can be done easily.

Steps followed:
1- Draw the profile like if you cut the figure in a half.
2- Set horizontal planes in points that define the shape (like when it changes the surface direction).
3- Place a surface that join the first profile (guide) with the horizontal sketches.
4- Done simmetry to get the other half of the train's nose.
5- That's all.

HERE I uploaded a PDF-3D of that part