The original letter is held in the museum's archives. Below is the version they have on display.
Transcript follows. Image kindly supplied by Richard Fellowes.

Image: Richard Fellowes
Transcript
Dear Sir,
I am arrive by passenger train Ahmedpur station and my belly is too much swelling with jackfruit. I am therefor went to privy. Just I doing the nuisance that guard making whistle blow for train to go off and I am running with lotah in one hand and dhoti in the next when I am fall over and expose all shocking to man and female women on platform. I am got leaved Ahmedpur station.
This too much bad, if passenger go to make dung that dam guard not wait train minutes for him. I am therefor pray your honour to make big fine on that guard for public sake. Otherwise I am making big report to papers.
Your's faithfully servent,
Okhil Ch. Sen.