or (913) 568-3001


If you do not follow all parts of an exception, then you do not qualify for the exception

Always read to the bottom, if not, you could be missing something important

COHMED Conference

 Jan. 27-31, 2020, in Louisville, Kentucky

The Cooperative Hazardous Materials Enforcement Development (COHMED) Program Conference is a focused, one-of-a-kind event for individuals and organizations involved in the regulation, enforcement and safety of transporting hazardous materials and dangerous goods.

The COHMED Conference provides a unique opportunity for the hazmat community to present concerns and perspectives about enforcement of regulations. The information sharing and problem solving that takes place at the conference, coupled with hands-on training and in-depth education, is critical to building cooperation among stakeholders. The COHMED Conference is an unparalleled opportunity to network, build better working relationships, learn the latest trends and techniques, and provide input into future changes and regulations.

Conference attendees include representatives from federal and state agencies, hazardous materials specialists, enforcement personnel, emergency planning managers and responders, academic institutions, interest groups and private industry from all across North America.

If you are involved in hazmat regulation, transportation, enforcement or safety, the COHMED Conference is one event you cannot afford to miss.

About Us


Our team

Although Railsback HazMat Safety Professionals (HMSP) is a company of me, myself and I, making Professionals plural is stressing that everyone involved in the transportation of hazardous materials is needed to ensure safety and compliance. Railsback HazMat Safety Professionals is owned and operated by Rex Railsback.  Rex has over 21 years of experience within the Hazardous Materials and Transportation community, dealing with compliance and training, as part of a 28 ½ year career as a Kansas State Trooper.  This experience is not limited to the State of Kansas, but throughout the United States training enforcement, regulatory and industry personnel. 


In partnership with Mayfield Carrier Services (MCS),, Railsback HazMat Safety Professionals (Railsback HMSP), offers all the services needed to meet your HazMat and DOT safety, training & compliance goals.

Contact Rex Railsback @ 913-568-3001, or Scott Mayfield @ 316-619-8292, 


Our history

Rex Railsback has over 21 years of experience within the Hazardous Materials and Transportation community, dealing with compliance and training, as part of a 28 ½ year career as a Kansas State Trooper.  During this career, Rex was a Master Instructor for the Federal Motor Carrier Safety Administration, National Training Center (NTC) in General Hazardous Materials, Cargo Tank Inspection, Other Bulk Package and North American Standard Inspection Part A and Part B.  Rex was also recognized as a subject matter expert for the courses.  Rex has delivered countless hours of instruction to enforcement and industry members over his career.  His ability to understand, interpret and train others on the convoluted federal regulations is second to none.  The knowledge and experience held by Railsback HazMat Safety Professionals could only have been obtained through decades of hands-on, real world application of hazardous materials enforcement. Rex conducted compliance reviews of motor carriers, hazardous materials shippers and cargo tank facilities to ensure compliance with federal regulations.  Rex is a past International Chair of the Cooperative Hazardous Materials Enforcement Development Program (COHMED) of the Commercial Vehicle Safety Alliance (CVSA).  Rex was a voting member on the CVSA hazardous materials, training and vehicle committees at annual conferences for several years. Upon retirement in December of 2017, Rex held the rank of lieutenant within the Motor Carrier Safety Assistant Program, Commercial Vehicle Enforcement with the Kansas Highway Patrol and was the State Hazardous Materials Specialist for Transportation.  


Our mission

Promote the safe transportation of hazardous materials through assistance with regulatory compliance and training. 

Site Content




49 C.F.R. Subchapter C Hazardous Materials Regulations Guidance;

  • Shipping Papers
  • Markings
  • Labeling
  • Placarding
  • Emergency Response Information
  • Training Safety and Security Plans

49 C.F.R. Subpart H to Part 172 Hazardous Materials Training;

  • General Awareness/Familiarization Training
  • Function Specific Training
  • Safety Training
  • Security Awareness Training

Assistance with HM Shipper Reviews

Assistance with Cargo Tank Facility Reviews.

HM/Non-HM Roadside Inspection Review

HM/Non-HM DataQ Assistance

Safety Training, including CDL, CSA, Cargo Securement, Pre-Trip/Post-Trip and Roadside Inspections

Visit Mayfield Carrier Services @, for additional services available.



Certificates of Completion:

Dept. of Homeland Security

WMD Rad/Nuc Awareness

(AWR-140), Oct. 2015

Federal Motor Carrier Safety Administration

Master Instructor Development;

  • General Hazardous Materials Inspection, Apr. 2012
  • Cargo Tank Inspection, Apr. 2012
  • Other Bulk Package Inspection, Apr. 2012
  • North American Standard Inspection Part A, Apr. 2012
  • North American Standard Inspection Part B,  Apr. 2012

Federal Motor Carrier Safety Administration

Cargo Tank Facility Review Instructor, Oct. 2011

Federal Motor Carrier Safety Administration

Basic Compliance Review, Apr. 2009

Federal Motor Carrier Safety Administration

Advanced North American Standard Level I Instructor Development Lead Instructor/Coach, Dec. 2007

Commercial Vehicle Safety Alliance

North American Level VI Train the Trainer, Jan. 2006

New Mexico Tech.

Energetic Materials Research and Testing Center

Incident Response to Terrorist Bombings, Feb. 2005



Below at links to publications by Rex Railsback:


Article's in the CVSA Guardian

HM/DG Training - Not Just a 

'Once Every Three Years' Endeavor 

Placarding/Safety Marks & Their Reason for Being

COHMED, Not just for HazMat Geeks 

Article in the Kansas Trooper

Zero Is Not Taboo

LabelMaster's Masters Series on HM/DG Transportation, featuring Rex Railsback.


Recent PHMSA Interpretations


  • Ref. No. 18-0121 - This interp has clarifications ref. the new 10 yr Pressure (Hydro) test for Propane Bobtails.
  • Ref. No. 18-0110 - This interp has some Q/A ref. HM Regs Applicability.
  • Ref. No. 18-0060 - This interp states that "undocumented CT repairs" are not valid and must be undone.
  • Ref. No. 18-0057 - This interp helps clarify shipping paper accessibility requirements.
  • Ref. No. 18-0021 - This interp helps clarify Function Specific training requirements.
  • Ref. No. 16-0085R - 173.5 (Agricultural operations) applicability Q & A.
  • Ref. No. 17-0077 - Listing Class "3" in the HM Description, is not OK for Combustible Liquids.
  • Ref. No. 17-0082 - Reiterates that the ER Phone # is required.
  • Ref. No. 17-0086 - Older ERGs are OK as long as ERI info is still valid.

Recent PHMSA Final Rules


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Railsback HazMat Safety Professionals LLC

Rex Railsback or (913) 568-3001