On 16 Aug, 14:38, chunky munky wrote:
You cannot carry on empty in a single track tunnel with a defective
radio unless a second person is also with the train operator or the
OPO alarm still transmits.

That is the rule, sure. Is there a reason why that is the rule (given
that the publicly stated reason for gibberingly paranoid radio failure
"no trains anywhere" rules is passenger protection)? If so, what is
the reason?

--
John Band
john at johnband dot org
www.johnband.org