In order to extend the line to Eagleson/March, there would need to be some road reconfiguration. This appears to be quite complex. However, if we could move the on-ramps to the WB 417, things get a bit simpler.
In this example, I have removed the existing WB on-ramps and relocated a consolidated on-ramp to the other side of the OPP station. This will make that short section of Compeau Drive busy, but I think that it can be handled with an extra turn lane, if needed..
The new off-ramp and on-ramp structures would be built first, since that work should not disrupt the traffic flow. Once the new ramps are in play, the underpass of March should be done using a top-down construction technique. At night, piles could be drilled and poured through the current road. Once cured, these will form the supports for the new bridge deck. This part should have minimal disruption on traffic. When it is time, the current road surface can be removed, forms put in place and the new deck poured, using the ground for support. This would, likely be done in stages to minimize traffic disruption. Once cured, the ground underneath can be removed, forming the new rail underpass.
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