East from Portlock I think they use 161.25 for the main line to Lamberts Point and 161.19 for the Sewells Point branch to NIT. Haven't noticed anything other than 161.19 in use at NIT.
Lamberts Point is confusing. My info is about 25 years old, and I'm still trying to work it out.
161.25 - main in & out
161.025 - hump
160.44 - empty yard
161.07 - had been listed as Pier 5, which I think is gone. Now NXDN and has shop-type traffic. Similar in Roanoke
160.305 - Pier 6A. Actually, this is the only freq that sounds like Pier 6 to me
161.490 - Pier 6B...haven't heard anything on this
161.385 - Car inspectors? Sounds about right, and I think it's a repeater
Portlock:
160.950 - Listed as Yardmaster, may still be
161.280 - car inspectors...still active, I think
160.335 - repeater with DPL (maybe 156?). Sounds more like it may be at Lambert's Point.
I'm not local, I just visit--so let us know if you find anything helpful.
73/Allen (N4JRI)