A rail transport system, comprising: a rail, provided with a first concave portion built thereon; the first concave portion being configured to be an escape passage, the rail comprising a first track beam, a second track beam spaced apart from the first track beam and a bearing floor being disposed between the first track beam and the second track beam and connected to the first track beam and the second track beam; and a rail vehicle, the rail vehicle comprising a bogie and a vehicle body, wherein the vehicle body is connected to the bogie and is pulled by the bogie to move along the rail, characterized in that the bogie has a second concave portion for straddling the rail, and the bogie movably straddles the rail, and in that the bogie further comprises: a bogie frame, the second concave portion is disposed inside the bogie frame; a first running wheel and a second running wheel, the first running wheel and the second running wheel being pivotably mounted on the bogie frame and being disposed coaxially and spaced apart, the first running wheel being fit on an upper surface of the first track beam, and the second running wheel being fit on an upper surface of the second track beam; and a driving device, the driving device being mounted on the bogie frame and being located between the first running wheel and the second running wheel, and the first running wheel and the second running wheel being driven by the driving device. a rail, provided with a first concave portion built thereon; the first concave portion being configured to be an escape passage, the rail comprising a first track beam, a second track beam spaced apart from the first track beam and a bearing floor being disposed between the first track beam and the second track beam and connected to the first track beam and the second track beam; and a rail vehicle, the rail vehicle comprising a bogie and a vehicle body, wherein the vehicle body is connected to the bogie and is pulled by the bogie to move along the rail, characterized in that the bogie has a second concave portion for straddling the rail, and the bogie movably straddles the rail, and in that the bogie further comprises: a bogie frame, the second concave portion is disposed inside the bogie frame; a first running wheel and a second running wheel, the first running wheel and the second running wheel being pivotably mounted on the bogie frame and being disposed coaxially and spaced apart, the first running wheel being fit on an upper surface of the first track beam, and the second running wheel being fit on an upper surface of the second track beam; and a driving device, the driving device being mounted on the bogie frame and being located between the first running wheel and the second running wheel, and the first running wheel and the second running wheel being driven by the driving device. a bogie frame, the second concave portion is disposed inside the bogie frame; a first running wheel and a second running wheel, the first running wheel and the second running wheel being pivotably mounted on the bogie frame and being disposed coaxially and spaced apart, the first running wheel being fit on an upper surface of the first track beam, and the second running wheel being fit on an upper surface of the second track beam; and a driving device, the driving device being mounted on the bogie frame and being located between the first running wheel and the second running wheel, and the first running wheel and the second running wheel being driven by the driving device.