We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What is a Backhead?

Mary McMahon
Updated: May 23, 2024

On a steam locomotive, the backhead is the part of the boiler that pushes into the cab. A number of controls are mounted on the backhead for use by the engineer and other train personnel, and it can also have a firebox door to allow the crew to check on the fire and add fuel, if necessary. In regions where steam trains still run, passengers may be able to see this part of the train if they can get close to the cab; it will be easy to identify because of all the controls. Museums can also provide an opportunity to see the boiler and backhead assembly up close.

Operators on a steam locomotive need to be able to control the conditions in the boiler to determine the train's speed and other operating conditions. One important control on the backhead is the throttle, connected to a valve to control steam pressure. People can close or open the valve to force the train to speed up or slow down. Pressure gauges providing feedback about the steam pressure are also an important component. The train needs to build up pressure before it can start running, a process known as “building up a head of steam,” and the operator needs to maintain pressure within a safe range to keep the train going and prevent boiler explosions.

Depending on the brake system, brake controls as well as brake pressure gauges can also be found in this part of the cab. To monitor water levels in the boiler, operators use a sight glass as well as check valves. It is important to keep the water level stable to prevent accidents and keep the boiler in good working condition, and a busy locomotive can go through water very quickly. The bell cord and train whistle controls are also typically mounted on the backhead.

The firebox door, usually located near the floor of the cab, provides an opportunity to look into the firebox, add fuel to stoke it, and move the fuel around if it is not performing as desired. The train operators need tools for manipulating fuel as well as grasping the door safely, as it can become very hot when the boiler is in operation.

The backhead can cause the cab to get quite hot, depending on the insulation level of the boiler. Ventilation may be provided through an open cab design or by windows that people can adjust to allow more or less air to flow through the cab. The proximity to the boiler can also make the cab dangerous, as it is virtually impossible to survive a boiler explosion at close range.

WikiMotors is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a WikiMotors researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Related Articles

Discussion Comments
Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.

WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.