Beware though, I think the whistles might be "off". My bet is that they're designs that were designed for ~200psi boilers, but they take a more throaty sound when run on the lower pressure boilers of period locomotives.
Not according to engineers at the site and a book I purchased at the site. They built the locos to operate and sound like the originals. As of 1991 they even smell like the originals as they converted from oil to coal for 119 and wood for Jupiter. There were a few places where they deviated from the actual prototype construction, such as the type of injectors, steel in the boiler instead of iron, painted aluminum instead of Russia Iron boiler jackets, the cylinder head cast as one piece instead of three, and the addition of air brakes (with the parts hidden in the fireman's seat). But the engineers there, Ron Wilson and Steve Sawyer, claim that from outward appearance - sight, sound and smell - they are authentic. For example, they rejected the delivery of the first batch of brass bells because they did not have the proper shape and hence sound. A second set had to be made and shipped just in time to finish on schedule.
