i think CREW must not look "high class" in passenger/ICE trains or else if there hapens anything wrong they will attack the CREW first..... guards must look like a common helpless person who is controlled by someone.... this also applies to station masters of a remote station or else he will be looted often....
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i know many will disagree but its followed by many of my known employees.. even other staffs like ACCAs/ACCIs, TLS , and other station staffs of bigger stations where mismanagement is quite normal and is unavoidable..