Photo by Daniel KramerThe polluters who turned Somerville into the Toxic Town described in an award-winning Houston Press story may have had a good result in the first lawsuit they faced, but a second one -- beginning a week from today in the town of Caldwell in Burleson County -- may be different. Somerville residents have sued the BNSF Railway, which ran a tie-producing plant in town. Cancer rates were far higher there, and BNSF failed to install standard pollution controls.In January 2008, th