The Canadian Prairies - Railways say the measure creates inefficiencies, farm groups say the opposite is true.
 
Farm groups from across the country are asking producers to lobby federal ministers and MPs and urge them to super-size a government proposal for what's called extended interswitching.
 
The measure, part of this spring's federal budget, essentially gives grain shippers a choice in which railway they deal with (as long as the competitor's line is no more than 160 kilometres away).
 
It means a railway would have to pick up the rail cars loaded by a shipper and hand-off the cars to the other railway.
 
"Extended interswitching is a vital tool for Canadian shippers that is proven to increase competition while lowering costs to shippers and consumers," Alberta Wheat tweeted in support of the Flip The Switch campaign.
 
The wheat commission, along with Alberta Barley and Alberta Pulse Growers, has joined a dozen other commodity groups and industry organizations in the lobbying campaign.
 
They want the budget pledge of an 18 month trial extended to five years, and the maximum distance for interswitching upped to 500 kilometres, so it applies to the Peace region and the Carrot River growing region of northeastern Saskatchewan.
 
"Extended interswitching is one of the only policy tools that has historically created competitive options for shipper business. It offers an alternative service provider for single-served shippers which balances negotiations in a way that encourages better service or pricing for the benefit of entire supply chains," Wade Sobkowich, head of the Western Grain Elevator Association, said in a release.
 
The railways disagree.
 
"Extended regulated interswitching is inherently inefficient because it introduces more operational complexity to the movement of rail cars as it unavoidably requires additional hand-offs for rail cars between carriers, which in turn causes increased cycle time," CPKC the railway formerly known as Canadian Pacific Railway, said in a response to the interswitching proposal.
 
"Overall, this slows down the entire rail supply chain and reduces capacity because it introduces inefficiencies that could otherwise be avoided."
 
It typically takes an additional 24 to 48 hours for interswitching, the railway said, adding a move to 160 kilometre interswitching in 2014 (that lasted four years) caused "significant harm to Canada's supply chains."
 
The alliance of grain groups calls this a "myth" on its website, arguing it actually improves efficiency.
 
"Extended interswitching will reduce congestion by moving traffic from a full capacity railway to a railway with excess capacity," the website states.
 
And bringing a measure of competition to the country's rail duopoly has been shown to cut freight bills, it contends.
 
"Data is clear that the increased competition from extended interswitching reduces costs for shippers who are using the rail network."
 
The farm groups' website also has an e-letter that producers can send to their MP.
 
In addition to backing a five-year pilot and a 500 kilometre interswitching distance, the letter urges the federal government to "invest in rural rail infrastructure that can accommodate larger trains to expand the use of interchanges."
 
Glenn Cheater.