[zcyknmrx] Red Line split at JFK and Savin Hill

on official diagrams, the MBTA Red Line is drawn to split into the Ashmont and Braintree lines south of JFK/UMass station.  in reality, the lines have already split north of the station, and the station has separate platforms for each line.  to catch the next northbound (inbound) train, you have to guess which platform to wait on.  there is technology that announces which platform will have the next northbound train, but I don't know how reliable it is or how much advance warning it gives, in case stairs or elevator are slow for you.

but wait, it gets worse.  even though the lines have split as of JFK/UMass, the tracks remain parallel and next to each other through the next station to the south, Savin Hill.  only trains on the Ashmont line stop at Savin Hill.  therefore, to get from North Quincy on the Braintree line to Savin Hill, you board the northbound train at North Quincy, watch from your train as it goes past but does not stop at Savin Hill, get off at JFK/UMass, walk up and over to the Ashmont platform, then take a southbound train back to Savin Hill.

who on earth thought all this was a good idea?  I suspect it has something to do with communities on the Ashmont line being predominantly poor and African-American.

redraw the train diagram to reflect reality, as a way of drawing attention to the stupidity.  JFK/UMass is effectively two stations with free transfer between them.  both branches go through Savin Hill, but only the Ashmont line gets a white dot indicating the train stops there.  only after Savin Hill do the lines go separate directions.