The City of Ottawa doesn't quite have a sterling reputation for rail transit. More than 50 years ago, the city scrapped streetcar service in the urban area in favour of personal automobiles and bus-centred transit. And in 1966, the National Capital Commission removed passenger rail tracks from Ottawa's city proper, relocating the city's train station out of downtown and to the southeast of the city.
Now, another potential loss for rail transportation in the area: The Ottawa Valley Railway, according to reports on CBC.ca, is in peril. The line, which runs from Sudbury to Smiths Falls, is owned by Canadian Pacific, and is currently out of use; they're planning on ripping up the tracks and selling the scrap metal for an estimated $50M, unless governments are interested in purchasing the line. Neither the federal nor provincial governments have stepped forward and publicly indicated any interest.
It's unclear what use the rail line could actually serve, though. It's certainly got historical value, as the Ottawa Valley portion of Canadian Pacific's cross-country rail line, but the line is out of service today, one assumes because it's not profitable to run trains on it. It may be a worthwhile purchase for the Canadian military, given that CFB Petawawa is right on the line, but they're not exactly in the business of running rail service. The chief value to governments would likely be as a strategic asset, as was noted in the CBC article; If CP is willing to sell the line for $50M or some similar price, that (plus associated refurbishing costs) would be a much more manageable price tag than trying to re-build it should the need arise in the future.
The O-Train marked a renaissance of rail transit in the city, even if it's taken some time for that to mature beyond that pilot project. Most city councillors are in favour of moving towards a rail-based transit system once again, though, and it seems the city is more friendly to it.