Discussion on:

In China, transit disruption prompts calls to ban Wi-Fi

for even getting wi-fi in a subway. So do the trains use the same frequencies or is it just poor design of the electronics (hint).

...due to Inferior technology or construction. So instead we'll find a technological boogieman like 'wifi" to blame it on.

Each and every day, thousands of airliners with far more complex and dependent electronics fly flawlessly with millions of people using wifi enabled devices without a problem. Seems odd that a relatively low-tech train cannot do the same.