optional halt meaning in English

任选停机
随意停机

Attention please , the train has an optional halt now , please wait for a moment , we apologize for any inconvenience
临时停车(旧) :尊敬的各位乘客,现在是临时停车,请您稍后,不便之处,敬请原谅
Attention please , the train has an optional halt now , please wait for a moment , and don ` t touch the equipment , and don ` t lean on the door
临时停车(新) :尊敬的各位乘客,现在是临时停车,请您稍后,不要触动车上的设备,不要靠近车门,不便之处,敬请原谅