Hi,

Here's a try, curves have been merged and simplified with blends and rebuild.
A temporary surface is extruded to blend both edges after.

Marc

I think you had all the components you needed to do what you wanted
some trimming and joining to get 2 continuous profiles and then a 2 rail sweep gives a good result

cheers
shayne

Hello all,
many thanks for your help. I've got a really important ideas and rules, I am going to learn and train how to cretae a train :-)
Will inform about results...
Jozef