Then please tell me what form of accident will lead to a breach of the container ?
Some years back I was the BR representative on one of the Regional Emergency Planning Committees, and I can tell you now that a rail nuclear incident was not even listed as a remote being of likelihood.
All I am saying is that I think it is better to be safe than sorry.
I'm not questioning whether or not the flask would leak. I know it's unlikely it would.
The public perception of nuclear is poor in general too.
If a stupid Politician can create a report like the one at the beginning of this thread, then if a flask was seen to be involved in any form of rail accident, imagine the media outcry if shoulders were just shrugged and it craned back onto a different carriage and sent back on it's way.