In the latest D&SNGRR operating rule book I have, the June 1, 2008 Edition, Rule 21 under TRAIN SIGNALS:
Extra trains must display two white flags by day, and in addition, two white lights by night, in places provided for that purpose on the front of engines as Classification Signals.
SMITTY GOIN' LOCO
LOCOMOTIVE ENGINEER, RETIRED
Last run July 24, 1992
Sometimes I sit and wonder how come I am not in a mental institution then I take a good look around at everyone else and realize, maybe I already am!!!