Government of Canada / Gouvernement du Canada
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Railway Track Scales for In-Motion Weighing Specifications (SI/91-21)

Regulations are current to 2020-11-02

Installation and Use (continued)

Approach and Departure Rails (continued)

 Every gap between the weighbridge rails and the approach and departure rails shall be minimized by means of transverse bevelling and overlapping of the rails or by any other similar means that reduces the impact at the gap.


 The stencilled tare of a railway car shall be used only for the purpose of determining transportation charges for goods and only if the following conditions are met:

  • (a) the stencilled tare weight shall be marked in 50 kg increments or less and shall be accompanied by the date on which the stencilled tare weight was determined; and

  • (b) the difference between the actual tare and the stencilled tare shall not exceed

    • (i) 150 kg, for a railway car of 25 000 kg or less,

    • (ii) 200 kg for a railway car of more than 25 000 kg but not more than 30 000 kg, and

    • (iii) 250 kg for a railway car of more than 30 000 kg.

 Where actual tare is used and stored in the track scale memory following in-motion weighing of an empty railway car, the actual tare shall be accompanied by a railway car identification code.

  •  (1) For weight assessment of commodities, other than to determine transportation charges, a train shall be weighed loaded and unloaded, and the difference between the two weights shall represent the net weight of the quantity of commodities in the unit train or each individual railway car, as applicable.

  • (2) The weights referred to in subsection (1) shall be erased from the track scale memory immediately after the printing of the net weight of the quantity of commodities.

 If the net weight of individual railway cars is determined, the gross weight, the tare and the net weight of each individual railway car shall be registered with the indication “gross weight” or “poids brut”, “tare”, or “net weight” or “poids net”, as appropriate, and where the information is stored in the track scale memory it shall be automatically cleared immediately after printing.


 Where the registration of the weight of a railway car is prevented for any reason, the railway car shall be re-weighed if the weight is being used in trade.

 All interconnecting wiring between the load cells, the junction boxes and the instrumentation that forms part of a track scale shall be shielded and grounded and enclosed in conduits.

 Load cell cables shall be separated from power cables and shall not be run in the same conduit.

 Shims or other height or level adjustment features of a permanent track scale shall be clean, smooth and made of steel or any other material of equivalent strength and, if not grouted, shall cover sufficient area under level stands or load cell bases to ensure maintenance of a stable and level condition under normal conditions of use.

 The operating velocity limits specified in the notice of approval issued in respect of a track scale pursuant to section 3 of the Act shall be prominently displayed near the means of registration of the track scale.

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