T1 Class. & Abbreviations on Their Pilots

[petey]

What would be the most prevalent classification light color on the T1s going west, say St Louis or Chicago. Also, what were the abbreviations on the pilots of the T1.
Not being from the East, I can only decipher 'Pittsburgh'.

[ExCon90]

The PRR didn't regularly use classification lights (you mean white for extra and green for a following section?), at least in the territory frequented by the T1's. As to the abbreviations, if you can quote them in a post I'm sure a number of readers will recognize them.