Bowser 70-ton offset 3-bay hopper stock#56700
This livery was first introduced by Tyco in 1977, imitating the signs of a coal company, and was later followed by Lionel, K-Line, MTH, Weaver, and others. For more information on Blue Coal, please see the following thread.
Blue Coal & Red Anthracite - Model Railroader / Prototype information for the modeler - Trains.com Forums