The MMEPBB stops at the dwarf signal to allow the MMEPB ahead of it to clear the bridge. New condos are being built in the background for the railfan who wants to be by the tracks 24/7.
Looks like an added stack on top of this SSW GP-60, but it's actually from the plant in the background, as the MMEPBB train rolls by the Arkilite facilities in Edmondson, Arkansas.