The post I found that image in had this explanation:
Quote:
At some point in 1955, there was 4 of them. I put them in the timeline of the DeLorean.
The one Marty used in the first Back to the Future.
The one the old Biff used to give the young Biff the almanac.
The one Marty used in the Second Back to the Future to fix the alternate timeline.
The one hidden by Doc in 1885 and fixed by them later.
So, the travel is
from 1985 Marty go to 1955 and go back to 1985
from 1985 Marty go to 2015
from 2015 Biff go to 1955 then back to 2015
from 2015 Marty go to Alternate-1985 then to 1955
from 1955 Doc go to 1885 and leave it there until it was retrieved by Marty in 1955
from 1955 Marty go to 1885 and finally to 1985
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