Japanese · Pronunciation Guide
de-n-sha, three beats — the nasal in the middle takes a whole count.
densha
One of the three units is a hum with no vowel. English reads two syllables and delivers two beats; Japanese counts three, with the extra time going entirely to the hum. In compounds like 満員電車 that nasal is even easier to lose, so it's worth over-holding at first.
Listen: 電車
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電車で東京に行きます。
Densha de Toukyou ni ikimasu.
I'm taking the train to Tokyo.
Listen: 電車で東京に行きます。
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電車で東京に行きます has 東京 (to-o-kyo-o), four morae made of two long vowels. So the sentence pairs a word whose extra length is a nasal with one whose extra length is held vowels — two mechanisms, four extra beats between them.
"DEN-sha" in two syllables treats the n as a closing consonant and stresses the first vowel. Hum it as a separate beat instead. The e also drifts toward "day" in English mouths — anchor the tongue for its whole duration — and the sha should be lighter and further forward than the English sound.