Why Human body feel Electric shock? in an Electric train during running , We did not feel any Shock ? why?

Unfortunately our body is a pretty good conductor of electricity, The golden rule is Current takes the lowest resistant path if you have insulation to our feet as the circuit is not complete (wearing rubber footwear which doing some repairs is advisable as our footwear is a high resistance path not much current flows through our body).The electric train is well insulated from its electrical system.

the human body is a conductor thats y we feel electrical shoke and the train is earthed thats y we not feel shock