Re: bar lines followed by barlines on a new line

[Vicente Solsona]

>   I would like to explicitly separate parts of music by having these bar  
> lines always at the beginning and end of parts, but they do not all  
> print.

the answer is probably at the Notation Reference 5.4.7 "Visibility of  
objects" -> "Using break-visibility"

> \version "2.13.14"

you seem to be using a highly experimental version ("pre-alpha" status).  
consider upgrading to "2.13.34" ("alpha near beta" status).

greetings,

Vicente