I recently painted this bridge girder similarly to the one I see near NY Ave in DC I first painted it flat back, then applied decal letters, sprayed grey and removed the stickers Came out ok, but tough to get letter all lined up. 
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I note you have an assistant double checking clearances. 😉
Curt
When they suggested adding Cat to your layout, they meant catenary.
Bruce
I am happy with this technique I used "Duro Decal Permanent Adhesive Vinyl Letters & Numbers: 3/4" Gothic Black" and rattle can black and grey.
Here it is the the black paint and decals added and then a view of the whole girder after the grey with decals removed
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Great work! Thanks for posting the pics.
Bruce
