The typical pronunciation of tràigh would be /traːj/ (so similar to try in English, but with Gaelic tap /r/ and long /aː/), and since here it comes after a nasal consonant, in some dialects it gets voiced, so /draːj/.
Look at the Nasalisation 2 or Why am I married to ə NɯNʲə agam? article on the Akerbeltz wiki or Nasalisation in Scottish Gaelic Phonology on Wikipedia. Voicing and nasalization after nasal consonants is a regional phenomenon in Gaelic.
Speakers of some dialects (Lewis, Skye) might even completely nasalize the /t/ to /ə n(h)raːj/ making the /t/ merge with /n/.