Thanks for sharing this lovely photo of a class GML gondola. Lots to take in. This car must some interior loading device based on the bolt heads on the car side. Many cars had Carmer cut levers, however this car has top mounted rod variety.
Lots of general wear and tear.
The Reading Company Technical and HIstorical Society "Bee Line" latest issue (V 41 issues 1 &2 ) has a very nice feature on this car class.