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Assuming that you are asking about the steel industry itself...
<kuid2:124017:10025:3> Steel Industry - Blast Furnace by maddy25
<kuid2:124017:10008:2> Steel Industry - Plate-Mill by maddy25
<kuid2:124017:10016:3> Steel Industry - Continuous-Process Strip Mill - No Name by maddy25
On the DLS
These assets go back to trainz build 2.0, some things are timeless.
If you are asking about the switcher that is a Jointed Rail BW9 included in the Pennsylvania and Berwind Content Pack http://jointedrail.com/product/pennsylvania-berwind-content-pack/.
If you are looking for a center cab switcher other than JR's there is always the 44 tonners and Davesnow did some Genset 14Bs which btvfd has done many repaints of as an Alco GS(C)415, all on the DLS.