Ted and Rod, thanks for the recommendation on the JST's. Just placed my order. Have an immediate need for 15 pair, so I'll have a few extra until the next order.
As it turns out, when I was all over eBay, Amazon, and the internet searching for what I thought (incorrectly, of course) were JST connections that LIONEL used, I found these same JST connectors and put them in my eBay shopping cart.
Thanks, again.