[Note 049.2] “Don't slang an unfortunate bounder”; is a play on words. The Oxford English Dictionary (OED) gives two relevant meanings for “bounder”: one being “A person of objectionable manners or anti-social behaviour; a cad. Also in milder use as a term of playful abuse” and the other “A four-wheeled cab or trap, so called from the bounding motion of the vehicle in passing over rough roads. The OED also gives two relevant meanings of “slang”: to cheat or give short measure; or to [verbally] abuse.

[Note 102.1] Bar571~Humble Heroes was published under the pen-name of 'Fun'

[Note 049.3] “It was back in the time of the strike, Sir,”; may be a reference to the national railway strike of 1911

[Note 102.2] "And then we 'spose we'll have some trembling pointsman 'at the bar'" :- The poet is cynically assuming that the pointsman will be blamed for any accident resulting from poorly illuminated locomotives.