VGN 2-10-10-2 - my 2014 challenge

[jwb]

This site <!-- m --><a class="postlink" href="http://www.steamlocomotive.com/chesapeake/?page=nw">http://www.steamlocomotive.com/chesapeake/?page=nw</a><!-- m --> says that the second option of routing high pressure steam directly into the low pressure cylinders via a booster valve was added to the Y6bs in the mid 1950s. It also suggests that the improvements in N&W Mallets after 1930 came from Worthington feedwater heaters and cast steel frames.