×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Dynamic Brakes

Dynamic Brakes

Dynamic Brakes

(OP)

What are Dynamic Brakes, how do they work, and why aren't they used anymore?  I see the feature in SD40-2 design plans.

Thanks in advance!

RE: Dynamic Brakes

Dynamic brakes are most certainly still used.  While in dynamic braking mode, the traction motors function as generators driven by the motion of the train, with the output power of the generators dumped across resistor grids, converted to heat, and dissipated with fans.

When you see a diesel locomotive in the consist with one of the big steamer, such as the 4449 trip through Montana last fall, the diesel gets more use as a braking sled than it does as additional motive power.

RE: Dynamic Brakes

After the 40 series, Electro-Motive moved the dynamic brake grids away from their traditional location (at least for EMD) over the prime mover.  The move allowed EMD to eliminate the dynamic brake "blister" on the 50 series locomotives.  The "blister" made it easy to spot if an EMD locomotive (GP or SD series) had dynamic brakes.  The dynamics were hidden away on most other locomotives.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close