Rick Grout made us a Berkshire for the Lakeside route to be a DLC addon. However he was not happy with it as it is an old "Legacy" model. It is not fully up to date for TS 2014 but it is still a nice unit. It is now a free addon for the Lakeside route. If you donated to get the route, go back to the RW&A Lakeside page a download the Pere Marquette Berkshire. It also comes with 3 new scenarios for the Lakeside route.
Additionally, Buzz and Harry Adkins have repainted some more units. Buzz did an F7 A/B set and Harry painted the included tank cars and gondolas into several other liveries. These are on the route's page and also in the file library.
Link to the route's page