Bogie (Truck) Explained: The Heart of Rolling Stock

Bogie (Truck) Explained: The Heart of Rolling Stock
November 24, 2025 4:47 pm
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Quick Definition: Bogie

A Bogie (or Truck in North America) is a chassis or framework carrying wheels, attached to a train. It provides flexibility for curves, suspension for comfort, and stability at high speeds.

Without bogies, trains would be rigid boxes unable to turn corners. A standard railway car typically sits on two bogies, each with two axles (4 wheels).

Key Components of a Bogie

  • Wheelset: The axle and two wheels.
  • Primary Suspension: Springs between the axle and the bogie frame.
  • Secondary Suspension: Air springs or coils between the bogie and the train body (crucial for passenger comfort).
  • Brake Gear: Discs or pads integrated into the system.

Interesting Fact: High-speed trains like the TGV use “Jacobs Bogies,” which are shared between two carriages, reducing weight and improving safety during derailments.