this design was widely used from the 1920s to the 1950s on all types of equipment

This is a MicroTrains 5100300 N Pennsylvania Railroad 34' Wood Sheathed Caboose with Straight Cupola #981128

trucks and operating couplers

Model Number: R15024A

This is a Con-Cor 223-6005 HO Scale Sound & DCC Decoder Fits Con-Cor North Shore Electroliner

Bowser 24808 HO SMS Baldwin DS 4-4-1000 Diesel Locomotive Sound #1494 ProductID_12093216 this design was widely usedThis is a Bowser 24808 HO Scale SMS Baldwin DS 4 4 1000 Green YellowEx Pennsy SC (Super charged) Diesel Locomotive with Sound #1494. It features: Ready to Run, super detailed, numbered, with DCC and Sound or Analog (DC). DCC and Sound version features LokSound Select decoder. Analog (DC) version has 21 pin socket for DCC module. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Bowser Model Number: 24808