[IAmBroom]

Does including a three-letter acronym (TLA) make your answer look informed (ALI)?

Because it's an article about outdated systems. Radio-controlled systems built in the last ten years, and in the future, are all mandated to be encrypted.

Furthermore, very few passenger train systems are radio-controlled. Instead, just like cars and buses, control is decentralized to the individual vehicle, and automated based on feedback from the track. No feedback, and the train stops.

[BikDk]

This ist a standard and ancient sender/receiver problem of communication. However, I'm glad you like big machines and seem interested enough to dive deeper into this topic. The official acronym TCS is still no match to your creativeness, please take it easy, as if you plan to do some research on this you will encounter a lot of those.