When the opportunity presents itself, I'm sure I could easily secure permission from the WMRHS to use images from their collection. It's sort of what they live for...
Lee
That's kinda what I had in the back of my head, there's stuff that's really not that hard to find if you look. The GN and NP historical societies act similarly and have gotten to the point of making records (including a significant selection of drawings) easily available online. There's plenty of PRR car diagrams available online too. There's the stuff available that's accessible through the Yahoo groups (to seek out permission for). And then there's the public domain stuff on the LOC and HAB websites, WPA images, etc.
David, I get what you're saying about the cost of a time-consuming research, measuring, a knowledgeable draftsman, etc. for detailed drawings; but there's more basic imagery and information available and more easily accessible via the web. And IMHO it's the passionate article writer's duty to find it and point it out to the publisher. But in some cases the article writer may not want that or the writing is poor so as to present little or questionable prototype info.