This concerns the T&P 17000-17749 series gons.
Sunshine's Proto Data Sheet 67.2 reads: "The rebuildings came during a
period when red paint began to be applied to T&P gons. By the early
Fifties at least, the T&P herald was being applied to new gons . . .
There is no known precise date of the new paint and lettering
standard . . . "
Has any information emerged that pins down the date T&P began
repainting these gons from black to red?