TheOneKEA wrote: ↑Tue Feb 21, 2023 9:52 am Thanks for the clarification. But I'm curious about why the MARC terminators would be on the western side of the station, closest to the station building, instead of in the middle of the station. Terminating trains from Union Station would have to cross through Amtrak and MARC services in CHARLES interlocking to reach Track 3, while terminating trains from Perryville (are there any such outside of early morning and late evening?) would have to cross through Amtrak and MARC services in UNION interlocking to reach platforms A, B, C or D. Placing the terminating services (most of which would be from Union Station) in the center tracks adjacent to platforms C, D, E and F would reduce the conflicting moves in CHARLES interlocking.Currently, they're building the new station, so the MARC terminals would be closer to the older station. Also, as mentioned earlier, should (and they better) Amtrak/Maryland opt to build the second two tubes of the F-D tunnel, those tunnels would arrange themselves to have MARC locals be aligned with tracks 4/5, leaving 6/7 open for through traffic.
Is there Amtrak-specific infrastructure adjacent to Tracks 6-9 that can't/won't be replaced/rebuilt during the rest of the station rebuild? Do you know of the reasons for the choice of location for the MARC terminators?
Of course, they'll have to rebuild BRIDGE interlocking to allow for it... and without expanding BWI's Amtrak station to 4 tracks, they'll have to turn WINANS into a 4-to-3 all-track interlock. Expanding BWI would be preferable though, because it'll allow Amtrak trains to stop and not have to mix with MARC traffic past GROVE.