The front page of the song sheet in the British Library shows Dan in the corduroy and brass buttons typical of the 1890s (i) The price of 3 shillings (a little under £6 at 2016 prices (ii)) suggests that the sheet was aimed at a middle-class customer.
(i) Simmonds, J. & Biddle, G; Eds. The Oxford Companion to British Railway History, p387
(ii) Bank of England Inflation Calculator http://bankofengland.education/inflationcalculator/
"I never minds the Buffers":- a play on the alternative meaning of buffers(2)
"We're not allow'd to take no fees / Or we our service break it" :- Railway companies made it a disciplinary offence to take tips. [Ref; Simmonds, J & Riddle, G Eds. The Oxford Companion to British Railway History, p387]. This facsimile of a ticket issued by the Newcastle and Carlisle Railway says at the bottom "Notice - No Gratuity allowed to be taken by any Guard, Porter, or other Servant of the Company". Gratuities were an important source of income to Porters. See bar339~Railway Porter Dan.
"this 'ere Hamper too- Marked "Glass with care," :- Just such a hamper is shown in this picture of Sam Cowell in what might well be the character of a railway porter. See Note 590.6.
"Beel he says to me":- the text offers the alternative of "Jock" to Bill. This piece may well be the song referred to in the obituary of Arthur Lloyd printed in The Era (July 23rd 1904) which says that "One of Mr Lloyd's songs was a Scotch edition, by permission, of Sam Cowell's Railway Porter". See Note 506.4