Residents Waterloo should be able to sleep in peace tonight, as CN Rail has agreed to stop sounding the whistle as it moves through the city at night.

After complaints from residents, CN told the Region of Waterloo that starting Thursday night, it will no longer sound the whistle within city limits and an order has gone out to all crews to start the new procedure effective immediately.

The booming whistle was heard through the night starting on the evening of June 10.

"I heard it all the way from Laurelwood and it was loud," said regional Coun. Sean Strickland, who received complaints from other residents as well.

CN issued a statement regarding the changes:

"CN apologizes to residents of Waterloo and Kitchener for the inconveniences caused by train whistling during the night. In all the communities where it operates, CN is committed to maintaining a positive and proactive approach," said spokesperson Alexandre Boulé in an email.

"CN resumed control of operations in Waterloo and Kitchener after a 20-year lease held by the Goderich Exeter Railway (GEXR) expired and experienced some issues in this transition. As a result of the feedback received, CN reviewed its procedures and the applicable regulations. Effective immediately, all CN trains will cease whistling at crossings in the area. As safety is a core value at CN and for regulatory considerations, please note that CN trains will continue whistling outside city limits, starting at the Farmers Market Road crossing."