The first photo shows the Weston and Colton visiting Gerry Leone's Bona Vista Railroad.   The Weston and Colton are "Oscar" and "Piker" kits that Walthers produced in plastic.  I remember older versions of these cars when I was a teenager.

The Susquehanna River passes through the Wyoming Valley, in Pennsylvania.  So, it is appropriate to have a car named for the river, since it too runs on the Wyoming Valley.

 

The first photo shows the stainless steel car, "Susquehanna."  The car is from Kato.

 

The second photo shows the "Susquehanna" visiting Jean Piquette's Cobleskill and Ballston Point Railroad.