PROCEED.-Raised and lowered vertically. See Rule 12

(b).

BACK.-Swung vertically in a circle at half arm's length across

the track. See Rules 12 (c) and 14 (h).

TRAIN HAS PARTED.-Swung vertically in a circle at arm's length across the track. See Rules 12 (d) and 14 (ƒ).