12690/Nagercoil Chennai Central (Weekly) SF Express
May be small correction. Minister's has never got any rake for kerala.
TVC is not the authority who decides about the rake. It is Zonal HQ who decides about it.
GS LHB rake of NZM-TVC lies in BBQ yard for more than 1 year, unutilized. While its sleeper and AC coaches were roaming in north as specials. MAS has to take final call regarding the rake utilization.
I guess you are referring to no.of coaches...Rake is set of coaches that are used to run the service.If you are having suggestion for increase of coaches for this please do write to IR via PG.