Lionel PA 6-14579

The "easy way" MTH DE0000018 universal diesel tire. https://www.mthpartsandsales.com

The "hard way" Go searching on Lionel Support using the product number https://www.lionelsupport.com/...-Passenger-Train-Set

Then click on the powered engine https://www.lionelsupport.com/...d-A-Unit-600-6-14579

Then scroll dow the list. Notice the alternate number "6208613206"

So I search using that number https://www.lionelsupport.com/...?keywords=6208613206

At least 2 different ones are "in stock".

Greg,

Here is the post number from the Lionel support engine diagram:

6208613206

First, go to the Lionel Parts site, lionelsupport.com, and type in the model number (6-14579), then click on the hit that comes up:

Now look at the parts listing for "Traction Tire":

Your part number is either of these:

   610-6001-065

   620-8613-206

Go to Google and do a search for either, for instance "Lionel 610-6001-065".

You'll see that Trainz.com has them in stock.

Mike

Just as note, the 8613 number is the stock number for the 0-6-0T Dockside engine.

Thanks to all who responded!! appreciated very much!!