By BRENT JANG - Globe and Mail Update

A strike at Canadian National Railway Co. is slowing down its train network, affecting everything from delivery of electronic imports from Asia to grain exports.

Amid efforts to secure a back-to-work order, Montreal-based CN said its system is running "at the 75-per-cent to 80-per-cent level," based on "traffic handled and network fluidity."

CN handles commodities worth $102-million daily on the Toronto-Montreal corridor alone, but no major delays were reported across its national system Monday.

The United Transportation Union, which began its strike on Saturday, countered that CN's performance is closer to 25 per cent of what would be considered smooth operations. CN declined to say how many managers are on the job, but the union estimates there are roughly 600 people filling in for 2,800 striking conductors and yard-service workers.

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More on the struggle

• Video - The town of Jasper Alberta comes out to rally behind the CN Conductors in their strike against their railroad.