Why was a rail link between Bangkok and Rangoon needed?
Why were Asians — mainly Tamil-Indians from Malaya — ‘recruited’ to build it?
Trying to tell this story is like putting together a 10,000 piece jigsaw puzzle when there are only 5000 pieces to work with and no picture to follow! Bear with us as we do the best job that we can.
============================
Two reasonably well done summaries:
https://anzacportal.dva.gov.au/wars-and-missions/burma-thailand-railway-and-hellfire-pass-1942-1943