A big thank you to everyone who responded. It seems staining may be the way to do. However, the Rit dye method does seem intriguing. I was pretty sure staining was the, preferred, I guess you'd call it method. But with a lot of attention to Krylon camo paints and growing popularity of acrylics, I thought I'd ask the question on what people are using. Clearly, I'll have to do some experimentation.
John I appreciate your comments about ballasting before laying the rail. I never thought of that. I have seem some of N&W Class J's video series. I will have to re-watch them before proceeding.
Gary, thanks for Detroit Railroad modelers club video. Lots a good info there, like I commented to Gary, I never thought of ballasting first.
I will have to keep an eye out for "weathered wood accelerator", looks like an interesting product.
Again thanks to everyone.