White Paper

Operational Strategies for Emergency Smoke Ventilation in Tunnels


This White Paper establishes guidelines for emergency ventilation of tunnels in the event of a fire.

Document History
Document Number Version Publication Date Publication Related Information
APTA SS-SEM-WP-013-10 03/15/2010 Published Current


equalization, suspension, wheel load equalization, wheel unloading


This standard establishes static wheel load equalization requirements to provide passenger equipment with the wheel unloading characteristics necessary to reduce the risk of low-speed wheel climb derailments. The Standard includes requirements for testing to verify compliance with the standard.

​Get Involved

Want to participate in development of this document? Join the Working Group or Learn More

Related Documents

​ ​​

Print Friendly, PDF & Email