The train's wheels are attached to a bogie.

A wheeled chassis or framework that supports a vehicle's body and is often used in rail transport.
The train has a strong bogie.
A bogie supports the car.
We checked the bogie's condition.
train bogie
wheel bogie
underlying bogie
truck
chassis
frame
The train's bogie was inspected before the journey.

A wheeled vehicle used for transporting passengers or goods, often seen in rail transport.
The train's bogie needs repair.
A new bogie was fitted.
Check the bogie for damage.
train bogie
under the bogie
replace the bogie
wheelset
truck
carriage