RickM46 posted:Gunrunnerjohn, you mentioned these alternative caps below; would you happen to have any and the lengths of their leads?
It's a 4.7uf 50V bi-polar capacitor, a cheap place to get it is Digikey as Lionel will have expensive shipping. Nichicon CAP ALUM 4.7UF 20% 50V RADIAL, 28 cents each. Shipping for small orders from Digikey is only around $3, and the ship very fast, usually in a couple of days you'll have your parts. You can have a few for around $5 total.
The beauty of Digikey is they have real parts with real specifications. For the cap above, for instance, they specify the lead lengths.