The following is information about the LCD billboard in this item 6-37006 that is not mentioned in the User's Manual and Lionel's website. I hope owners of this LCD Billboard flatcar find it useful.
1.) While it comes with a partially loaded 128MB SD/mm card (111MB free of 120MB), the device itself is able to recognize and use SD/MM with a capacity up to and including 4GB provided they're FAT32 formatted, although naturally the larger the card, the longer it will take to access the files on it. SD/MM CARDS LARGER THAN 4GB WILL NOT WORK!
2.) Photos are processed and played by an application named DPFMate350 which resides in the the billboard's internal memory.
3.) For video the program uses an app named Motion JPG. It contains a small MJP fomat file conversion tool needed to convert videos so they'll play on the billboard. That Motion JPG app is only loaded on the Lionel 128MB SD/MM card in a file named MJP Converter So if you plan to show video on this billboard, IT'S CRITICAL you copy the MJP Converter file and store it safely since the MJP format is proprietary to LG cellphones and should the file ever be corrupted, erased, or in anyway compromised rendering it inoperable -- there is no download of it available from either Lionel's website or elsewhere on the internet!