How do you best use Partisans in PZC?

[StupidSteel]

Hi!

Im new here so forgive me if this question have been asked before. For some reason i'm not allowed to use the search function, so i have to ask directly: How do you best use Partisan units in PZC? I wanted to blow some rails behind enemy lines with them, but got a message that said 'No valid units have been selected to damage rails'...
So... Am I doing it wrong or isnt partisans capable of blowing up rails in PZC? If thats the case - why?

Thanks.