Commemorative article I brought in about failing railway (8)
I believe the answer is:
obituary
'commemorative article' is the definition.
(article remembering someone's life)
'i brought in about failing railway' is the wordplay.
'brought in' is an insertion indicator.
'failing' indicates an anagram.
'railway' becomes 'ry' (abbreviation for railway).
'about' anagrammed gives 'obtua'.
'i' placed within 'obtua' is 'obitua'.
'obitua'+'ry'='OBITUARY'
(Other definitions for obituary that I've seen before include "Brief tribute written to someone who has died" , "Brief newspaper account of prominent person after death" , "Short newspaper piece about deceased luminary" , "Account of a life after death" , "Newspaper article about person recently dead" .)