HISTORY:
In 2001 when the O-train was built, an S-curve was introduced at the northern station, at Bayview. This S-curve on a hill was forced by a decision not to spend $700 to move a Hydro Pole by a former city of Ottawa "transit" planner.
This curve has caused a lot of wheel squeal as the train has to put on its brakes, go around the curve, and then applies power to climb the hill. The reverse happens when it travels south: it coasts down the hill, brakes, squeals around the curve, and then has to apply power again at the bottom.

This problem isn't just about noise: it also causes excessive wheel and track wear, and consumes fuel. A straight track on a hill would otherwise provide a perfect brake for the train. For a calculation of how much money is lost yearly by the presence of this pole, see the comment to:
http://www.friendsoftheotrain.org/node/221






