I am very sorry to hear that Frank has passed away. Frank and I not only shared Railways and Model Railways as our hobbies, we were both also Radio Amateur's. Frank was indeed a very knowledgeable character and will be sorely missed. R.I.P Frank.
P.S I've just read this thread https://www.facebook.com/groups/12699105116/permalink/10166429522395117/
It looks like Frank was in the process of getting back on-air, how very sad that he didn't make it. In the Amateur Radio world, Frank is now said to be SK (Silent Key).