While 3DP Train has identified specific railcars for these chalk mark to be applied on, however I feel they can be used on any freight car. The markings are very fine and easily read up close. Being a firm believer in Mr. Koester's "Three Foot Rule" and that really applies to these decals. From three feet away, the chalk marks look like they were made by scale HO people! I plan on putting these chalk marks on a whole bunch of railcars, so after payday I will be ordering more. I recommend you purchase some too. Thanks.