smallspy
Senior Member
The bridge over McCowan is wide enough for 2 tracks (not 3), it's true. But double-tracking over it only buys about a kilometer of distance before the next choke-point which would prevent it from being widened further.Ummm, the above would seem to conflict w/the below:
To be clear, I actually looked at the aerials over the entire section of corridor, and what I noted was:
1) The bridge over McCowan clearly has ample room for additional track:
View attachment 509212
Not a single track bridge:
View attachment 509213
I count room for three tracks.
And considering the work required to the signal system in order to allow for that, CN has likely come to the conclusion that it's not worth it. They've had 60 years to lengthen the double-track that far if they really felt that it would help.
Absolutely not. Only a single track. The distances between the girders are only just wide enough for a single track.
And look at the abutments as well - there is no additional support beyond what exists immediately under the bridge.
Same as above. Only a single track, with no room for expansion.The crossing at Markham road is set up for two tracks:
View attachment 509214
Those three bridges cover the western 1/3 of the route.
Single track again. Same bridge construction as the above two, although 9th Line has the added fun of having to cross the CP's Havelock Sub as well.***
Point taken, however, that other crossings are single span, notably the Rouge, CP and the 401
I can't make up my mind on 9th Line or Steeles, both look like twin track design from underneath and have one up on top now, but the one on top the aerial view is not convincing as to sufficient room for twin track.
I don't think that the geography is particularly difficult through there, and so I suspect that doubling through here would be relatively easy.****
On the siding; for the benefit of others (this distance roughly agrees w/ Dan's assessment):
View attachment 509229
That's 7,800ft (includes sections where second track was clearly present but is now clearly abandoned/disused.)
***
I'm not sure of the extent of work required for the embankment to extend the passing track to the south/east, but were it otherwise viable, you could get to ~3.4km total length before hitting the level crossing at Woodview.
But Woodview is a problem. If it was grade-separated, then there is no reason why the double-track couldn't extend to just west of the bridge over Fairport. CN would then have a single 1 mile long stretch of single track (the bridge over the 401) in between two double-track sections, and which would give them a lot more flexibility.
Dan