Who do you suggest for custom lettering decals for locos and rolling stock

Check the "Decals" listings in the Scenery Sourcelist...

Of which I've been very satisfied with this source.   He made these and custom-sized them to fit the ends of the modified Lionel RDC..

KD

Read this thread for suggestions:

I need help finding lettering | O Gauge Railroading On Line Forum (ogaugerr.com)

I use Modern Rail decals, and Precision Design Company. Both are easy to work with and very good quality decals.

It's possible to make your own. You can buy Clear Decal sheet material that can be printed with an Ink Jet or Color Laser Printers using your art work. Then cut it out of the sheet and apply like any standard water type decal.

Coat with a Clear or Dull coat to finish up.

Thanks Gents for your input'.  I see there's many decal suppliers on the net.  I'm waiting to hear from one company I contacted.  I'll most likely go with one that has been mentioned here. 

Rob, your cars look pretty good'.  Did you receive your E-8s....

Good thread

Highball graphics.  

https://highballgraphics.com