Check out http://www.walthers.com
They list the following N scale diesel locomotive traction tires:
Vinyl Super Traction Tire (package of 20 $6.95) Part# 192-1505 IN STOCK
Super Traction Tires ($6.95) Part# 192-2505 ON BACK ORDER
You can order directly from Walthers or from your hobby shop.
Peace, Happy Thanksgiving and High Greens
"I like my Pullman Standards & Budds in Stainless Steel flavors, thank you!"