I don't understand why only operating personnel should be on them or why OBS personnel should not be on them or what the safety reasons could be. If those are the rules, then they need to be changed. In the case of the man in the wheelchair who needed a lot more help than his daughter and the SA could give them, I hate to think how that could have turned out. One radio with one sleeper attendant can do a lot more good than harm.
You don't understand because you are ignorant of railroad operations. The frequency is for train operation not customer service. It needs to be kept clear for that purpose. That does not need to be changed. Should not be changed.
As far as the wheelchair the SA does not need a radio to get help. There are other OBS and there would be operating crew on the platform. Operating crew would know there was a passenger getting off the sleeper. Also they should have informed a member of the operating crew about the passenger having a wheelchair prior to the stop. Lastly there is a PA on the train. They can get on the PA and request assistance.
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