[twoNeurons]

Downstream is left in that image (West). Upstream is on top of the Rail Bridge.

Upstream would link directly with McBride, but have to go over some industrial and need some expropriation of residential land in Bridgeview for the approach on the Surrey Side.

50m upstream would not align too well with McBride, but it would go over parks and empty land so would be less expropriation. The upgrades to approaches on either side, however, make this option more expensive.

All that being said, Bridgeview needs revitalizing anyhow, and given the chance to unify Rail and Road in a new Bridge, I think it's the logical choice. However, I'd imagine there would need to be an interruption in rail service if they built a new rail bridge exactly where the old one was.