Does this mean the gasser is back?
http://www.tower-models.com/towermodels/On30/on30/locos/gas/index.htm (http://www.tower-models.com/towermodels/On30/on30/locos/gas/index.htm)
I don't think so, the gas mechanical wasn't in this years catalog. It's too bad so many On30 engines aren't returning. But according to the site they may still have some in stock from Bachmann's last run of the gas mechanicals. I'd contact them to find out. Good luck!
That website page is from last March 2013.