As discussed in a post of a couple weeks ago-here's a link that provides overview of various types of IP, creation, maintenance etc.

Perhaps the most interesting portion of the article from the perspective of the use of heralds or insignias of railroads is as follows:

"Trademark rights are acquired through the continuous use of the mark in association with the relevant goods and services. Interruption of the use can result in loss of rights."

As always, specific questions should be directed to competent legal counsel.

Pennsylvania CPA Journal -Brief Overview of Intell
superheater@rrmail.com