After the accident, the signal was reconstructed. The old signal head was dismantled; four 12-inch signals (probably TCT) were put in the fixed signal head. The signal head remained in a light color, though it was a light gray (like the MDC signals in Boston). More recently, the signal head received a coat of green paint, and a copper-colored spike on top. Photo taken 4 July 2002.
The aftermath of an accident may explain some things about the famous signal.
The signal in the middle of the road is not the only historic unit. There is another oldie one block away.