Re: Vulcan Fairlie top speed and livery question

The Mountaineer was green. For more details, order Prospector Volume 19 number 3 from the Rio Grande Modeling & Historical Society, which covers the Mountaineer pretty well including some detail about the colors.

Those double fairlies in your illustration are not in any way "sister locomotives" to the Mountaineer except for the fact that they were built by the same company. They appear to be late 1880s/early 1890s locomotives, whereas the Mountaineer was built between 10-25 years earlier. You can see in the photos of its factory-new appearance and its later rebuild that there are very few visual similarities except in wheel arrangement: Vulcan Mountaineer Photos