There are numerous synonyms for the phrase "catch a train". Some of the most commonly used synonyms include "board a train", "hop on a train", "get on a train", "take a train", "ride a train", and "embark on a train". These synonyms can be used interchangeably and can help add variety to your writing or speech. It's important to note that each synonym may have slightly different connotations, so it's best to choose the synonym that best fits the context in which it is being used. Regardless of the synonym used, the idea remains the same: to successfully get on a train and travel to a desired destination.