Lionel made a bunch of things under military contract during WWII, including plugs and jacks, as well as straight keys and bugs. You mention J-37. If I recall, J-37 was a straight key -- not a bug -- with a leg iron. Miles B. Anderson, K2CBY 16 Round Pond Ln. Sag Harbor, NY 11963 Tel.: (631) 725-4400 Fax.: (631) 725-2223 e-mail k2cby at optonline.net