What makes eBART light rail?
I mean... this looks like an LRT vehicle to me: https://commons.wikimedia.org/wiki/File:Westbound_eBART_train_approaching_Pittsburg_Center_station,_May_2018.JPG
I'll go ahead and make the
nldrs and
autsst systems tier 4 then? Because the trains they use on many routes are the same as eBART
Dutch example,
Austrian example. They don't look like light rail though to me though!
OK, sure,
here it's undeniably a light rail vehicle. Because of the nature of the tracks, not the vehicle. And the nature of the tracks in Austria are commuter rail, Netherlands local/commuter rail, California rapid transit, and Camden trams (the rest of the line outside Camden city centre is local/commuter rail though).
It sure ain't a subway train, so it does not belong in tier 3.
Because it's short? Francophones aren't going to be happy when I lower their metros like the
Rennes Metro and the
Lausanne Metro to tier 4 and pretend they are light rail because they went with short-vehicles-high-frequency. The
Lille Metro train looks more 'light rail' than the eBART one.
It's described by wiki as a "hybrid" system having elements of both light rail and commuter rail, which... yes, fair. Which means it belongs in either tier 2 or tier 4 depending on which side it tends more towards.
Citation needed on the light rail thing. It's only 'light rail' because of weird legal status that US law encourages it to be called that and so avoid a load of draconian regulation that makes no sense for an entirely segregated rapid transit system (dare I say 'metro' - other than the power supply, it meets wikipedia's definition!) like this.
It's also listed as commuter rail because BART is commuter rail (though I'm fine with it being in the more prestigious tier 3 than tier 2). Wiki calls BART 'rapid transit' which is code for 'we had a big edit war over whether its commuter rail or metro because its both and people seem to think you can only be one or the other so we settled on a more generic term'.
I agree with it being in tier 4 because it's a shuttle connecting to the end of a tier 3 line, which means it serves a function consistent with tier 4. Wouldn't make sense having the subordinate lesser service in a higher tier than the service it's subordinate to.
At last a good bit of reasoning! I agree with all of this.
However, we have places where the shorter-train diesel shuttles are merged into the rest of the line. I don't know why we are treating Antioch as different from Wassaic, Port Jefferson, etc. It's inconsistent. All are treated as the same line (unlike say, the Mattapan line in Boston - where its drawn as and called a different line, even if its red), all require a change of trains.