Update: Marty posted a couple of RS3s on Facebook that clearly have poling pockets.
|Milwaukee Road||760||FM H10-44||1944||Yes|
|Santa Fe||543||FM H-12-44TS||1947||Yes|
|MN&S||21||Bald DT-6-6-2000||1948||Yes||deep pockets|
|C&NW||4160||EMD GP7R||1952||Yes||back of step|
|Illinois Terminal||1605||EMD GP7||1953||Yes||back of step|
|MBTA*||902||EMD GP9||1956||Yes||back of step|
|CB&Q||504||EMD SD24||1959||Yes||back of step|
|C&NW||6847||EMD SD40-2||1974||No||hole, not pocket|
|Digital zoom of profile picture|
a video of it starting after 10 years of disuse, I learned it was an EMD GP7. (It looks like they started cranking it by the 0:22 mark.) They took a video of the guts after finding and freeing up the seized cylinder. From AngleFire I learned it was built in 1952.
I learned from Diesel Shop that MBTA 902 was a Massachusetts Bay Transit Authority EMD GP9 built 6/1956.
David Kamptner posted an IRM shot to Facebook Railroad Photography. Note that Illinois Terminal 1605 has polling pockets. My shot of C&NW 6847 is at the beginning of this post, and I did not see any pockets. David got a better shot of the front of C&NW 1689, and I can't see any pockets on it.