Just using Las Vegas as an example:
Someone wants to book a trip to Las Vegas, they know (or may have been told) they have to take the SWC. So they look at the schedule and see the SWC stops at Las Vegas! They may not notice it’s NM and not NV - after all, it‘s only 1 letter off!
I have heard of that case causing issues, but again I think it just depends on the context whether the full name is necessary. Regardless, I think we have both got our points across. There's not really much to argue about on the topic.
From Amtrak Service Line Plans FY20-24 : "Chicago Union Station is the HUB of Amtrak’s National Network". There is no other mention of a HUB station in the network.
Is also specifies Amtrak's National Network rather than Amtrak as a whole. If the LD network by itself is considered, the hubs would be different than for the entire system. Chicago is certainly the main hub in such a case, although I would also consider the following cities as hubs.
-New York (terminates 6 LDS)
-Washington (terminal for CL, services 6 total LDs, major transfer point, trains in 4 directions from metro area)
-Los Angeles (terminal for 3/4 LDs from 3 directions, major transfer point)
-New Orleans (terminal for 3 LDs from 3 directions, transfer point from Crescent to SL)
I would then define the following as focus cities:
-Seattle (terminates 2 LDs from different directions)
-Portland (terminal for EB, also serves by CS and acts as transfer point between them)
-Sacramento (transfer point between the CZ and CS)
-Emeryville (terminal for CZ, also served by CS)
-San Antonio (terminal for TE, also serves by SL and acts as transfer point between them)
-Savannah (terminal for Palmetto, served by 3 total LDs, travel in 3 directions)
-Charlottesville (transfer point from Cardinal to Crescent, service in 3 directions
-Galesburg (transfer point from CZ to SWC, service in 3 directions)
I suppose some of them are stretching the definition a little bit, but given how skeletal the LD system is it's hard to leave out any transfer points. Technically Cleveland is also a transfer point but the transfer only works in one direction, is somewhat roundabout, and has very poor hours so I left it out.