On Mar 10, 2023, at 3:04 AM, Martin Koppenhoefer <dieterdre...@gmail.com> wrote:
> ...they can last for several years.

In the case of Caltrain, they are an essentially-permanent feature of the train 
service, as passenger rail shutdowns (anticipated or not) happen "frequently 
enough" (not the same as "frequently") that these are given their own 
route-numbering subspace in the structure of the service.  Saying "oh, no, it 
looks like we'll have to catch a 6-train" (meaning a "bus bridge" because of an 
accident or some such) is understood among Caltrain riders that a 
transfer-from-rail-to-bus is about to happen.  They don't last for several 
years in this case, they are a "feature" of this particular rail service, and I 
don't think Caltrain is the only train service for whom such a thing is true.

We should map them as a bus route, I would say, but they should be 
"associate-able" with the train service in an easy way.  (That's what Caltrain 
does by including these busses as "600-series" trains, when they are not 
trains, they are busses).  I like "rail_replacement_service=yes" as a good 
start to identify these.  We can do this.
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