First, many thanks for your encouragement, it helps me to go further.
Here is a photo of the actual state of works, I do some masking and now there is two layers of primer.
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Unfortunately I forgot to mask the shuttle race and the needle plate support, I will have to sand these places carefully.
I choose the final color, it's a metallic blue.
Philippe
PS : For Caroline94535 it's not my train line, it belong to two close friends and I stay in their large garden during my holidays. You could see some other photos here :
http://www.forum-train.fr/forum/view...hp?f=8&t=13742 . It's in French but Google translator is your Friend. I also transmit your message to my son