^The speed limits are different if you have grade crossings and if you don't. Right now the speed limit probably isn't any higher than maybe 25 at best inside Springfield's core. With grade separation you can have your 110 to whatever the braking distance for the station stop would be. With a mile, more or less. Probably a little less, as passenger trains are light and can stop more quickly than 6000' of coal gons. So it saves you real time. The railroads love grade separation. A lot. Saves you the trauma and paperwork of running over idiots too. Train crews don't actually enjoy having run people down. Even foolish people. I don't particularly like accidentally running over squirrels. I can only imagine the trauma of crushing a passenger vehicle. And management doesn't like the paperwork. (There's always paperwork. Did the signals work? Was the crew following the speed limit and using proper whistle signals? Were the lights working? Paperwork. Not to mention fixing the damage, should it surpass scratched paint and bent railings.)
As to the conflict south of town, you mean Iles junction? I'd say this makes that simpler, since you'll be reducing congestion on the UP line. And if the whole thing becomes a joint line you can cross trains over anywhere in town rather than just at Iles. It sounds like they're not really planning a joint line, but two dedicated, grade separated double track mains will still be an improvement over what's there now. If you clear the junction quicker things flow more smoothly. And the Hannibal sub isn't that busy, so I can't imagine it's a big problem for UP/Alton train speeds anyway.
As to the conflict south of town, you mean Iles junction? I'd say this makes that simpler, since you'll be reducing congestion on the UP line. And if the whole thing becomes a joint line you can cross trains over anywhere in town rather than just at Iles. It sounds like they're not really planning a joint line, but two dedicated, grade separated double track mains will still be an improvement over what's there now. If you clear the junction quicker things flow more smoothly. And the Hannibal sub isn't that busy, so I can't imagine it's a big problem for UP/Alton train speeds anyway.




