Transportation of Dangerous Goods Update

Summary#

This is a proposed update to the Transportation of Dangerous Goods Regulations published in the Canada Gazette, Part I on December 9, 2023. The package would tighten rail safety rules (buffer cars), limit a farming exemption for transporting anhydrous ammonia, align the rules with international and other Canadian nuclear transport rules, and adopt two updated container standards; Transport Canada estimates a net monetized cost of about $6.25 million over 2024–2033. Comments were invited for 75 days after publication.

What it does#

• Rail safety and buffer cars

  • Requires at least one buffer car (empty or loaded with non-dangerous goods) between any occupied locomotive and a rail car carrying dangerous goods on all trains, including unit trains.
  • Clarifies that train‑dynamics exceptions do not override the buffer car rule.
  • Prohibits placing certain tank containers or intermodal containers carrying dangerous goods next to occupied railway vehicles or equipment with a continual ignition source.

• Agricultural anhydrous ammonia (nurse tanks)

  • Narrows the old exemption so it only covers field application (not general road transport).
  • Removes the old volume cutoff of 10,000 L and instead allows only a single or twin nurse tank configuration on a trailer.
  • Requires an emergency response assistance plan (ERAP) for agricultural anhydrous ammonia in transport above 3,000 L for trips on public roads longer than 3 km.
  • Requires nurse tanks that rely on the field-application/documentation exemption to display the ERAP phone number.

• Nuclear and radioactive materials

  • Brings TDGR into line with the Packaging and Transport of Nuclear Substances Regulations, 2015 so certain unclassified radioactive waste and medical radioactive materials can be moved one time for proper characterization under controlled conditions.

• International harmonization and classification

  • Updates many special provisions to match the UN Recommendations (UN Model Regulations): refrigerating machines, shipping names for alkali and alkaline earth metals, pesticide classification for 26 UN numbers, household light‑bulb exemptions in certain collection/recycling cases, unpackaged articles rules, and clearer wording for medical/clinical waste (UN3291).

• Technical standards and other clarifications

  • Replaces the old rail container standard with two dynamic references: CAN/CGSB-43.147 (tank cars) and CAN/CGSB-43.149 (ton containers), so updates to standards apply automatically.
  • Adds or clarifies practical items: voluntary display of UN numbers on vehicles, clearer residue labelling (“Residue – Last Contained”), revised placarding rules for short on‑site moves, allowance for open-valve oxygen cylinders for medical or aquatic uses, and explicit permission for enforcement officers to carry necessary dangerous goods for duty.

• Administrative effects

  • Codifies some activities that Transport Canada had been approving by temporary equivalency certificates (ECs), removing the need for repeated EC applications for common, lower‑risk activities.

Who's affected#

• Railway companies and their crews — Transport Canada estimates 26 federally regulated railways would be affected; CN and CP are the largest carriers.
• Dangerous‑goods shippers and freight customers who use rail (especially shippers of unit trains).
• Farmers and farm businesses that use nurse tanks for anhydrous ammonia — about 2,300 nurse tanks are estimated in the system, but it is unclear how many owner‑operators currently lack ERAP coverage.
• Small businesses that currently use equivalency certificates — the proposal would eliminate 43 recurring ECs and is estimated to benefit 20 small businesses.
• Transport Canada and inspectors — added inspection checks (farm ERAP verification and rail buffer compliance).
• Medical and waste handlers who move small quantities of radioactive materials or clinical/medical waste (classification and documentation rules would change).

If a point is unclear in the source: the exact number of farmers who would need new ERAP coverage is unknown.

Why it matters#

• Crew and public safety: Buffer cars add separation between dangerous goods and occupied locomotives. That gives crews more time to escape in an incident and brings Canada closer to the U.S. practice for unit trains.
• Farm safety and emergency readiness: The change limits multi‑tank trailer practices and expands ERAP coverage. That means larger roadside shipments of anhydrous ammonia would have formal emergency plans and contact information visible on tanks.
• Trade and compliance: Updating shipping names, classifications, and container standards reduces differences with international rules (UN) and with the Packaging and Transport of Nuclear Substances Regulations, 2015, making cross‑border rail movement and international shipments easier to manage.
• Costs and savings: Transport Canada’s analysis shows a net monetized cost of about $6.25 million over 2024–2033 (including an estimated $5.30 million capital cost to buy buffer cars and about $1.05 million in buffer‑car operating costs), but it also counts around $0.11 million in savings from removing repeated EC applications. Transport Canada expects qualitative safety benefits to outweigh the monetary costs.
• Timing and next steps: This is a regulatory proposal (not yet law). If finalized, most changes would come into force after a transition period of 6 months following publication in Canada Gazette, Part II; the new rules for nurse tanks would come into force after 24 months to give farmers time to comply.