Train of Jericho

Albert and Leslie joined for a cigarette at the back of the depot.
These secret smoking spots became the only secure places against the spying eyes of the AG, since the cigarette was forbidden in the whole area of the research center.
However that was required to check or get checked your safe places regularly by some lower ranked officers of the security department.
Lower officer could be bribed with some rare spices, and that was not a problem for Albert, because he worked at the herbal research department.

"Did you heard that we will implement defense horn on a train?" asked Leslie after gave back the lighter to Albert. "I heard that project was cancelled, because the sound effects more to the humans than zombies". "No, that's a lie! You can bake the brain of those fucking living deads with sounds waves while you listening Mozart." Les ashamed himself right away.
"Sorry, I know your daughter is somewhere between them." "It's all right, I don't even know she is still a living human or her brain got rotted by the infection." Albert slipped a last one and treaded his stub.
"Anyway back to your news. Why they started to produce zombie alert horns just now?" "First of all, these are more like sound cannons than horns. Only a train can transport them. Even a bigger truck would suffer its weight and energy supply. Second, the engineers developed a copy right noise for the attack waves in the last half year, so no one can reproduce it. The AG don't like any competition, just remember those poor lavender farmers."
"But if we could make them smaller, we could even make self-defense alter horn." "Yes, but the AG still get its biggest profit from the synthetic lavender, why should they kill their own success?" "Then someone else will found out the secret of the attack waves." "Yes you can decrypt the sound, if you have some hundred zombies to test on them, but not to produce it. You have to make your woofer from tetracolar to achieve the proper efficiency of the waves. And all the tetracolar mines are owned by the AG."
"Oh, of course. That was enough cheer up for today, back to work and kill some zombies."