Take a cue from DMRC in Delhi. Though it is impossible to switch locals to metro but it can be tried in phased manner.
Comparing both Metro offers better security (closed doors), comfort (AC) and operational viability. Sub urban services investment towards security is negligible as it makes huge operational losses. Daily commuters with monthly passes contribution can hardly support its financial viability.
As for people getting killed in trying to cross tracks that can be stopped only if under & overbridges are made & strictly enforced.