Install de mod and try to load my game:

Error while appplying migration: Eletric Train: EletricTrain_0.16.2.lua
EletricTrain/migrations/EletricTrain_0.16.2.lua:2:attempt to index field 'eletric-railway' (a nil values)

I have the same problem
Factorio version 0.16.51
save was made with electric trains 0.16.8
currently electric trains 0.16.9

Error while applying migration: Electric Train: ElectricTrain_0.16.8.lua

ElectricTrain/migrations/ElectricTrain_0.16.8.lua:2: attempt to index field 'electric-railway' (a nil value)

fixed

Working...

that has fixed it ;)