"March 23, 2020 ... Patrick, how did your idea come about?I’ve been in the advertising business for a long time. I started at J Walter Thompson In New York. 14 years ago I got a call from a friend and railroad guy about running ads on the side of freight cars Why don’t we work together? We named the company Freight Train Media. We did some development work and over time came up with patents on two designs. We call them Portable Rail Billboards (PRBs). The idea was to run LED ads on the side of stationary or rolling container cars (PRB l)and to develop a billboard product that will mimic a standard board and be placed on a flat car (PRB ll). My company, Freight Train, owns these patent rights on the PRBs.
One design has a billboard unit that can go up and down and can turn. It will turn to be readable from a freeway. Potentially the nation’s railroads and rail freight yards offer a tremendous growth opportunity for billboard development in an industry with few undeveloped sites.
How would you power the billboard
We use a generator. We worked with Formetco on a number of these iterations.
What are you seeking?
My plan is to license the rights to use these Portable Rail Billboards for a fee and percentage of ad revenue. "
https://www.billboardinsider.com/digital-billboards-on-rolling-stock/
Okay, so who is going to make the first operating model?
It seems the idea does go back a few years,
https://www.ble-t.org/pr/news/headline.asp?id=18633
“ Tuesday, May 15, 2007 Cleveland men want to turn freight cars into billboards (The following story by Frank Bentayou appeared on the Cleveland Plain Dealer website on May 12.) “