The red sign is to notify the trolley driver to raise the pantograph and retract the shoe because he was about to run out of third rail. You can see the third rail between the tracks in the foreground. This is a cool system that they have in Bordeaux, France where only short sections of third rail are activated with power right under the car so that pedestrians and vehicles on the streets don't get zapped. The third rail is only in the down town section and catenary in the suburbs. There is a similar sign on the back side of the pole with a down arrow to notify the driver to lower the pan and drop the shoe.
Speed limit sign on the former SAL main at Camden, SC, with Amtrak's Silver Star permitted 55 MPH and the lone local that remains on the line 40 MPH.
We have fresh snow today, which looks right purty! And a peeling and fading sticker does remind us how treacherous the pretty white stuff can be!