Nice selection. Your spares look quite extensive too.
I have managed to resurrect several locos myself.
Motors where I bit of bother for 3, but I have sourced a New 3 Vdc unit which I adapt to replace the old one. As the shaft is smaller the gear has been replaced too. 3 locos have New motors, the Yellow/Black/Red Flyer, Diesel shunter and Steam engine on the diesel chassis