Spanish · Pronunciation Guide
el trehn — one syllable, with a crisp tr and a fully released n.
One syllable, and therefore no placement question. The plural "trenes" adds a syllable and lands its beat on TRE, the second-to-last, straight from the default rule. Neither form needs an accent, which is the usual situation for short nouns of this shape.
Listen: el tren
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El tren sale a las diez.
The train leaves at ten.
Listen: El tren sale a las diez.
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"El tren sale a las diez" uses the present tense for a scheduled departure, exactly as English can. "Sale" is stressed SA-le with a fully pronounced final e, and "diez" is one syllable with a z pronounced as a plain s. Say "a las diez" and it links into a-las-DYES.
The tr cluster is the whole challenge: English speakers produce "chren", because their own t before r is affricated. Slow it down to "tuh-ren" and compress. The vowel then wants stretching toward the English "train", when Spanish wants a short flat "eh" with no glide at all, followed by a clean n.