I totally agree. Here are the population of the major towns on the way. Larger than I expected, but still hardly throbbing metropolises. I am also not sure how many people in those towns actually commute to Ottawa, or would building such a service be encouraging needless sprawl?
| Town | Population
(2016) | Driving Distance to Ottawa Station (km) |
| Petawawa | 17,187 | 166 |
| Pembroke | 13,882 | 149 |
| Renfrew | 8,223 | 96.1 |
| Arnprior | 8,795 | 68.6 |
To build such a route, the Renfrew and Beachburg Subs would have to be upgraded (it is mostly Class 1&2 track) and extended to connect to CPR's abandoned valley line (the abandoned parts of the Renfrew sub have largely been built over). This wouldn't be all that hard to do, but the whole project wouldn't be cheap either.
The other big problem with commuter rail in Ottawa is that Ottawa no longer has a downtown train station. This means that almost everyone will have to transfer to the O-Train, with most of them traveling in the same direction as all the other commuters. With a downtown station, at least those who do have to transfer will be traveling contraflow. While it is theoretically possible to revive Ottawa's old Union Station, it would be expensive (and difficult) to do so, and without a huge demand from commuter rail, it wouldn't be worth the expense, especially considering VIA wouldn't likely want to use it, since it would be a detour from their existing route.
If Commuter rail were to come to Ottawa, it would probably start, after HFR is complete, with service from Perth to the two Ottawa stations via Smiths Falls and Richmond. Here is a similar chart for that route. The populations are lower, but the distances are shorter and high quality track would already there so a pilot project could be started rather inexpensively.
| Town | Population
(2016) | Driving Distance to Ottawa Station (km) |
| Perth | 5,930 | 87.6 |
| Smiths Falls | 8,780 | 78.7 (only 66 km by train) |
| Richmond | 4,482 | 37.1 |