Recorded 2 minutes of the Iron Smelter working under load because I honestly can't stop staring at it. If you're curious about the stations: the display shows how full the buffer is in 5% steps, green light means the station is free and open, and yellow means a train is either on its way or already docked. The stations also dynamically set train limits and routing priorities based on buffer levels.

If you're interested, you can check out all my blueprints here: https://fprints.xyz/user/177bc5fb-4dd4-43a5-bd9e-e46b9edfb87c