Highway signs as Railroad signs

At the intersection of Oxford Avenue and Santa Fe Boulevard, Englewood, CO. Yes, the stop light really did control the movement of the D&RGW locals off the branch line.

Anyone else have examples to add? 

There was -- and maybe still is -- a pair of octagonal red boulevard Stop signs at a diamond crossing on the balloon track in the Diesel Service area of Barstow Yard.  This had always been a burr under my saddle, and when I was appointed Road Foreman of Engines there in 1984, my office partner was the Rules Examiner, and the Assistant Division Engineer had his office right across the hall.  I soon brought up this travesty of un-railroady signage, reminding them that the Santa Fe standards book showed a Stop sign (as used to protect diamond crossings per Rule 98) as being a horizontal red rectangle, with or without dog-ear corners.  That, I stated is a stop sign for a train.  A highway stop sign is for a highway vehicles.  The Rules Examiner agreed that it was not the traditional train stop sign, but advised me that, when this had previously been complained about, the Superintendent (who, to no surprise, was an ex-Switchman) persuaded the System Engineer to add the highway stop sign to the approved signs, while retaining the rectangular sign.

Oh, well, an army has to be choosy about what hill might be worth dying for, and this was not one of them.  Still, it is cheesy to use highway signs for trains.

 There are lots of Stop signs  (octagon)  on branch lines were a train only runs every few days or weeks, Crew must stop and make sure crossing flashers (if equipped) are working  before entering the crossing. I don't think they have STOP printed on them , just the red octagon.   (pain in the butt for crews)

In my experience, when there is street running (track inside a paved roadway) and there are traffic signals, when a train enters a circuit approaching the traffic signal, it turns the traffic signal green for the roadway in which the track is laid, and keeps it green until the train has left the circuit.  If traffic signals were allowed to cycle normally, railroad equipment could not react quickly enough if a green signal changed to yellow and then to red.  However, the train is indeed governed by the traffic signals while operating in the street.  If the only rail equipment is a trolley instead of full size railroad equipment, then the signals can cycle normally.

Traditional highway "STOP" signs protect the crossing at SF Jct in Fort Smith, AR on our rails.  The other railroad over the crossing uses the red rectangle stop sign.

Always thought it "odd" to see "STOP" signs on a railroad.

Oregon California & Eastern Railway circa 1974: a stop sign at the end of the East Switchback.