Hindi · Pronunciation Guide
ṭrayn — the t is retroflex, tongue curled back, and the r is a tap; not the English word "train."
ṭren
The cluster at the front adds no beat, so the word stays monosyllabic no matter how much work the tongue is doing. Its length sits in the vowel between the cluster and the nasal.
Listen: ट्रेन
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मैं दिल्ली की ट्रेन ले रहा हूँ।
Maiṁ Dillee kee ṭren le rahaa hooṁ.
I am taking the train to Delhi.
Listen: मैं दिल्ली की ट्रेन ले रहा हूँ।
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"Maiṁ Dillee kee ṭren le rahaa hooṁ" uses kee because ṭren is feminine in Hindi, and the bare stem le carries the progressive. Dillee's doubled l sits just before the retroflex cluster, so the tongue moves from a long front contact to a curled-back one.
English speakers simply say "train," which gives an alveolar t, an English r and a diphthongised vowel. All three have been changed in the Hindi version. The retroflex is the most audible fix — curl the tongue back before you start the word.