* ワ : boxcars, wood-lined
* テ : boxcars, iron-lined/waterproof
* ス : boxcars, steel-lined
* カ : stock cars
* ツ : ventilated boxcars
* ポ : pottery cars
* レ : reefers
* ウ : pig transport cars
* ト : gondolas
* ク : auto transporter (from 1965; prior to 1965, these considered covered cars)
* シ : special duty transporters
* チ : flatcars
* コ : container flats (from 1966)
* リ : gravel cars
* タ : tank cars
* ミ : water cars
* エ : rescue/emergency cars
* キ : snow-removal equipment
* ケ : scale test cars (after 1966; prior to 1966, コ)
* サ : work vehicles
* ソ : cranes
* ヒ : idler cars
* ヤ : test cars, rolling laboratories, etc.