Bogie, rail vehicle having same, and rail transport system

A rail vehicle, comprising:

• a vehicle body;
• and
• a bogie mounted on bottom of the vehicle body, the bogie comprising:
• a bogie frame, wherein the bogie frame has a straddle recess for straddling a rail;
• a first running wheel and a second running wheel, wherein the first running wheel and the second running wheel are pivotably mounted onto the bogie frame respectively and are coaxially spaced apart;
• at least one driving device, wherein the at least one driving device is mounted onto the bogie frame and located between the first running wheel and the second running wheel to drive the first running wheel and the second running wheel;
• a first horizontal wheel, wherein the first horizontal wheel is pivotably mounted onto the bogie frame and is for fitting in on a first side of the rail;
• a second horizontal wheel, wherein the second horizontal wheel is pivotably mounted onto the bogie frame and is for fitting in on a second side of the rail;
• and
• a first horizontal safety wheel connected to the first horizontal wheel and moving in synchronization with the first horizontal wheel, and a second horizontal safety wheel connected to the second horizontal wheel and moving in synchronization with the second horizontal wheel, wherein an outer diameter of the first horizontal safety wheel is less than an outer diameter of the first horizontal wheel, and an outer diameter of the second horizontal safety wheel is less than an outer diameter of the second horizontal wheel.