I'm an industrial electrician. Changing well-embedded standards and technology is extremely difficult, except over the course of decades to century+. Locomotive

I'm an industrial electrician. Changing well-embedded standards and technology is extremely difficult, except over the course of decades to century+. Locomotives use 64 volts for control voltage. Eight 8-volt batteries. (Drive voltage is 500-750, usually 600.) Why? Because they settled on it when locos were first electrified, long before 12 volts was a standard (or other, now common voltages). Many steam engines had 32 volts; 64 was an easy doubling to handle higher power start loads. They will continue to be 64 volt until the end of time.