My father left for Beijing by train.的同义句是My father took a train to Beijing."a"能改为"the"吗

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My father left for Beijing by train.的同义句是My father took a train to Beijing."a"能改为"the"吗

My father left for Beijing by train.的同义句是My father took a train to Beijing."a"能改为"the"吗?
不宜把."a"改为"the".因为到北京的火车不是仅有一趟,他乘的是【其中之一趟】,所以用a.