You may want to check this:

To check the setting of the car transfer contacts:
1. Place the selector carriage at the center of the master floor bar by
rotating the shaft until the pointer is again at zero on the dial. Move
carriage so that CCR is in the center of the floor bar contact.
2. Without moving the selector carriage, see that brushes UCT and DCT are
touching the neighboring floor bars.
3. Move selector carriage in the direction for up travel until the first
down slow down brush has passed the first slowdown contact on the master
floor bar. At this point, the transfer brush, DCT, should still be
touching the contact on the master floor bar. If this is not the case,
move brush DCT until it touches the floor bar contact.
4. Repeat the operation for the up transfer brush, UCT.
The positioning of the transfer brush is
essential for a one floor run slow down sequence. Upon energization of
relay UX, for instance, for a one floor up run, relay CC is energized
just prior to running. CC picks up CS, which seals in IFR, and the car
accelerates to one floor run speed.