PRR Marker Lights & Signals

[Cincykid]

Were the Pennsylvania's marker lights red & green or red & yellow? Also, on the Pennsy's position light signals there was often a single light lower on the pole below the position light. Was was the function of this light? What did it signify?

Thanks,
Cincykid

[dehusman]

According to the 1951 PRR Book of Rules:
By day , unlit.
By night red to the rear, except in manual block territory when clear of the main track, yellow to the rear.
(nothing mentioned about front or side)

The 1910 PRR book of rules :
on single track :
green flags by day.
Green lights to the front and side, red lights to the rear, except when clear of the main track green to front side and rear.
on double track:
green flags by day.
Green lights to the front and side, red lights to the rear, except when running against the current of traffic, then green to front and side and a green light to the rear on the side next to track for trains moving in the direction the train is going and red on the other side to the rear.

If gets weirder on three or more tracks.

Dave H.

[Anonymous]

regarding the lower single light, when it was lit it indicated stop and proceed prepared to stop at any obstruction.
From an old LIRR book which RR also used the position light signals.

[Anonymous]

I have to clarify that. When the single light was lit below the horizontal row of lights.