SOM-1004 HO track cleaner car Slider Block (used on Shine-O-Matic car #1002)
Go to link below for instructions on how to load Slider Block:
https://ppw-aline.com/collections/shine-o-matic-brand-new-ho-track-cleaner-car-comes-in-kit-form-developed-by-a-line-fits-athearn-40-box-car/products/som-1-loader-block-instruction-sheet