I just went to Atlas O website and located the 6924 Non-Derailing Board for $28.95 each. I place the number 10 in the cart and the website said they have "0". The item is backordered. Glad I bought some five years ago.
Here is Atlas O's solution, but they don't have any.
I am not trying to beat up Atlas O. I love my 600 Atlas O Master Line cars. I probably should sell some and re-claim an upstairs bedroom.
Terry Christopher emailed me that Atlas O will be taking over his Custom Signals when he retires. Hopefully these beautiful signals will be available for other railroaders. Again, I am glad I bought all styles of Signals and many of the connector cables to allow the signals to talk to each other. I just have to get down to my "Valley of Bridges" layout and finish it.
Sincerely, John Rowlen