help identifying replacement truck for Lionel double door boxcar

I had the same exact problem on my Railbox boxcar.  Replacement truck was not threaded where I needed just as you show.  I had a co-worker (machinist) run a tap down the other hole without issue.  I wish I remembered the tap size.   

It looks like there’s enough meat on the ordered piece to tap out the hole. Check the size of the hole with a drill bit. You can find tap and drill charts on line. They usually show the correct numbered drill as well as the nearest fractional size. See what comes close and by a tap. A dood hardware store may have what you need. If not. A well stocked hobby store usually carries the Du bro line. A good pin vise is all that’s needed and some cutting oil. Diecast taps fairly easily.

For the life of me. I don’t know why you would make a chassis that wouldn’t accommodate the center hole of the truck. I’m guessing it’s to change the pivot point of a longer car to negotiate a tight curve. I believe the Standard O cars from years past did this.

The truck screw for your product is shown below.  Somewhere in those numbers is the information you need for the tap you need.  The screw is 2 mm diameter by 5 mm long.  The 0.4 thd .200 must be the thread information.

Success! I used a tap and adapted the purchased truck. Boxcar is back on the rails.

Thank you!!

Glad to hear. Please share tap size just in case any of us has to do this again.  

Here's the tap I used:

Drill America - DWT54156 #4-48 UNF High Speed Steel Tap Set