Steve, I would say that I'm indifferent. But frankly, perhaps my method uses up more time, but the result just the same looks satisfactory to me. For me here in Europe I had to add a substantial amount for postage, so FOR ME it wouldn't pay off. Judge for yourself!
I used a #4 brush and slightly water-thinned oxide red acrylic paint. Then I slobbered the paint on the rails from both sides, trying to hit more or less only the sides of them - and at the time I didn't care much if I hit the rail tops or not. I did about 2 yards at a time, then I cleaned off the rail tops with household tissue. This is is the state shown in picture 1.
After the paint dried, I ballasted the track with granite sand (I bought it as 'bird sand' in a pet shop). Pcture 2 shows the final state of the track on this bridge.
Brakie: So YOU buy a spray can of Krylon primer for $1.00-1.50???
Here in Switzerland such a can costs at least $6-7!!! Lucky guys, what you are!
Ron