Special sets from K-Line for York, see:
http://www.k-linetrains.com/products/viewprd_new.cfm?prdID=B3D79647-9EAA-4D47-9576777B4165999B&secID=B17A068D-6D44-11D4-ADA90060B0576B82
http://www.k-linetrains.com/products/viewprd_new.cfm?prdID=8F4D2643-DCF6-4F06-B95CF8A64AA04773&secID=B17A068D-6D44-11D4-ADA90060B0576B82
http://www.k-linetrains.com/products/viewprd_new.cfm?prdID=C37ABA82-946C-49F0-BA07149CD1C50682&secID=B17A068D-6D44-11D4-ADA90060B0576B82
-Tinplate Jeff