Wayback when, we had stencils and artwork for correct D&RGW numbers. I created them from various sources including tracing original D&RGW numbers and amazingly enough blowing up 1/2" scale Thinfilm decals to fullsize and cleaning them up. I then masked the lettering off with tape and sprayed the numbers on the engine. When the RR went to stick on vinyl lettering, I made up more correct artwork to send to the lettering printer to get the correct numbers. A look at pics taken in the mid-1990's show pretty good numbers on the engines.
Appearently the company that did the lettering went out of business and the artwork disappeared.
The current lettering appears to be some sort of generic font. Every RR had thier own version of Railroad Roman with it's own little quirks.