Thanks, that'll work.
Denny, I just planned on bolting them onto several spots along the rail. Looking through your project I'm sure you're familiar with this, but for reference to those who aren't,
galvanic corrosion . The zinc blocks are the sacrificial anode meaning they corrode away while your steel is protected. The other cathodic protection scheme I know of is impressed current which does what is says, pushing the current with a power source instead of through the natural voltage potential between dissimilar metals. That's more for industrial, stationary stuff though.
