With the prices of Athern rolling stock being what they are, for a starter set Tyco stuff is okay. As was said, to make them reliable, you need to body-mount Kaydee-type couplers. IIRC, for awhile Tyco was marketing Mantua-made steam locomotives. Those were okay, and made some dandy bases for kitbashed locomotives. Their diesels were, IMHO, awful! But, if they run, fine.