PRR Keystones ??

Jim Betz
 

Hi,


  I'm not a Pennsy modeler.  Would someone please provide the years

for the introduction of the various forms of the keystone logo - I think

there are only(?) 3 ... keystone, circle keystone, and shadow keystone.


                                                                     TIA - Jim B.

Join main@RealSTMFC.groups.io to automatically receive all group messages.