Erm... Look at the 9128H timesheet I posted...
E shift should be Extended Shift. Driver does AM peak till
around 9am, 10am. Gets a 1.5 to 3hour Swing. Then continues again
from 11am, 12pm onwards till end of PM peak.
T shift are Three-Quarter Shifts. Driver usually starts in later AM
peak and continues all the way to PM peak with no Swing.
For S shift, yes, they are supposed to drive the same bus (unless
got step backs where driver changes bus). But sometimes, if
something happens, they might send another bus in the PM split
shift. Like maybe they sent the original bus to cameo on another
svc because of a breakdown.