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Many of you might already know that due to historical reasons, Japan uses two incompatible power systems with mismatched frequencies

That has its consequence in railways too

Meet Tokyo Central station. As you can see, western and eastern Shinkansen lines terminate here. They're not connected with each other and use different electrification depending on which part of the country the line goes to – 25kV 50Hz or 60Hz

Normal-speed lines use 1.5kV DC electrification

This small infodump was brought to you by @aroma who brought my attention to that detail

#railinfodump