The 22 M3's are the ones at Arch St. The gons are most likely the ones at Lilco in Hicksville. The old "gray gons" there are in need of wheels, which is probably not going to happen. The high side '90s era ones, the RR never filed the proper paperwork to extend their interchange beyond 40 yrs, so they are not interchangeable and will most likely be cut up. The Locomotives are the 503, and probably the 3100.
Everyone:
I will agree with EH that the 22 M3s being offered are the group stored at Arch Street Shop.
With the M9s under indefinite delivery delay the remaining 140 (or thereabouts) M3s will be
needed for the foreseeable future - the next 3-4 years into 2020-2021 probably...
The two M1s are likely the two former sandite units E401 and E591 - and hopefully not the
stored 9745-9746 pair...
There could be stored MP15s and SW1001s among the locomotives being offered along with
the 503 and 3100. A list of the locomotives being offered would be interesting to us all here...
MACTRAXX