Train whistle testing being conducted by CP Rail is driving some southeast Calgary residents around the bend.

The testing began a couple of days ago as part of a new requirement by the Federal Railroad Administration.

CP Rail officials say this is a one-off test to see if the noise level of the horns is in compliance.

But they also admit the testing could continue until the end of July.

On Friday, CP officials decided to scale back the hours it could test to 8 a.m.-5 p.m. instead of the original 7 a.m.-9 p.m.

But residents in both Inglewood and Ramsay say the tests are still too much to bear with blasts that can last up to two minutes at a time.

"It's just I suppose the constant of it, you know it's so out of place it really makes you wonder what is going on," commented resident Todd Ford.

"We want to encourage pedestrians and people having conversations on the street and it becomes very invasive to the kind of business we are trying to conduct," said Rebecca O'Brien with the Inglewood Business Revitalization Zone.

The tests are being done in seven North American cities including Toronto, Montreal and Moose Jaw.