The creosote/PCBs could be a liability if used near wetlands or in water but above ground I like the idea of equipment mats or a place to keep attachments out of the mud. Could also be used as fence posts and that's popular here in Texas.
I've got some really big ones on my property when the power company switched from 70' wooden poles to 110' concrete poles. I haven't figured out what I'm going to do but was thinking of making a bridge for a mule or small vehicle to cross an arroyo or ditch.
"You Can All Go to Hell, I'm Going to Texas." --Davy Crockett