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***Yes, it can go faster than the speed of sound (in air). More and more trains, especially passenger and very large, heavy freight trains are using ECP brakes which make use of electronic control signals to actuate all brakes on the train effectively simultaneously (rather than the old vacuum/pneumatic controls which could take 10s of seconds to propagate to the rear of the train). This improves braking, preventing the rear cars from heaving forward into the front cars while the brakes are being applied.