At first I thought a man was carrying something, but upon zooming in I discovered it appears to be a kerosene lantern hanging on an iron post. Talk about a trip hazard! I assume this was so the vehicles turning left after dark would not run into the raised platform. In 1937 the PCC streetcar would have been brand spanking new.

In the horsecar era, the front platform was the exclusive domain of the "mule skinner". Passengers boarded, paid their fares to the conductor, and disembarked at the rear platform. This practice carried over into the electric streetcar era.

As public transit ridership declined, conductors were eliminated and the front platform was used for boarding and collecting fares as well as running the car. The "Front Entrance" notice alerted passengers to board there, not at the back.

Wonders why they needed to specifically sign the "Front Entrance" at the FRONT of the Bus, was there a "Rear Entrance" on the Back?

... Seeing myself out, thanks

[Maybe it's for folks who can't tell the difference between a bus and a streetcar? - Dave]

Bus, Streetcar, Locomotive ... Tomato/Tomahto, Same Question.

We didn't have them around my neck of the woods.
https://www.american-rails.com/pccs.html