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Locomotive Wheels for Heavy Haul & Freight Trains

Locomotive Wheels for Heavy Haul & Freight Trains

Product No.：202394204828
Material：M201
Standard：AAR
Production time：75
weight：215
Package：Wooden Box
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AAR M-107 locomotive wheel for heavy haul freight? Class C D 36-38" specs

1. Product Description

What is an AAR M-107 locomotive wheel and why does it fail in heavy-haul service?

An AAR M-107/M-208 locomotive wheel is a monobloc forged or rolled steel wheel manufactured for North American freight and heavy-haul locomotive service. Its job: transmit traction and braking forces from the rail to the bogie while withstanding extreme thermal and mechanical loads. When a wheel fails, you get tread shelling, thermal cracking, wheel flats, and derailment risk.

What are the AAR wheel classes and which one should you specify?

AAR M-107 defines five wheel classes based on carbon content, hardness, and application

What are the AAR wheel classes and which one should you specify?

AAR M-107 defines five wheel classes based on carbon content, hardness, and application:

Class	Carbon (%)	Brinell Hardness (HB)	Application
L	≤ 0.47	197 – 277	High-speed, light wheel loads, severe braking
A	0.47 – 0.57	255 – 321	High-speed, severe braking, moderate loads
B	0.57 – 0.67	302 – 341	High-speed, severe braking, heavier loads
C	0.67 – 0.77	321 – 363	Light braking, heavy wheel loads
D	0.67 – 0.77	341 – 415	Low speeds, heavy braking, high loads

What wheel diameter do you need for your axle load?

Wagon Capacity	Gross Rail Load	Wheel Diameter	Wheel Load	Axles
125 ton	315,000 lbs	38″	39,375 lbs	4
100 ton	263,000 lbs	36″	32,875 lbs	4
77 ton	220,000 lbs	33″	27,500 lbs	4

For 286,000 lb gross rail load (286K GRL) interchange service, wheels and axles must comply with AAR Standard S-286. Over 90% of bulk equipment acquired since 1991 has been rated for 286K GVW.

What are the common failure modes for heavy-haul locomotive wheels?

Thermal Mechanical Shelling (TMS) – One of the main causes for heavy-haul wheel removals in North America. Caused by prolonged tread braking combined with high wheel loads
Thermal cracking – Shortens wheel life; severe braking may result in complete wheel failure

Wheel flats, spalling, and tread band wear

Technical Specifications Table – AAR Locomotive Wheel Classes

Parameter	Class C	Class D
Carbon Content (%)	0.67 – 0.77	0.67 – 0.77
Brinell Hardness (HB)	321 – 363	341 – 415
Microalloying	None	V, Nb, Mo
Primary Application	Light braking, heavy loads	Heavy braking, high loads, low speeds
Tread Damage Resistance	Standard	Superior vs. Class C
Fracture Toughness	Standard	Higher than vanadium-microalloyed steel
Typical Wheel Diameter	36″ – 38″	36″ – 38″
Design Standard	AAR M-107 / M-208	AAR M-107 / M-208
Quality Standard	AAR M-1003	AAR M-1003