The newer-issue MTH freight cars come with mounting locations for Kadee coupler boxes. I normally use 2mmx8mm metric screws (same ones for locomotives), but on the Gunderson cars, the holes were set up for 2-56 screws. Some of the first Kadee-compatible MTH cars came with shims so you could use the hi-rail wheels and the couplers would be at the proper height. On MOST of the older cars, you can drill holes to mount Kadees, but in some cases you may need to add shims, or in the case of the lumber cars, you need to notch the end sill.
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