I would also like to mention that it would be nice to have a limit on the amount of resource one signal train can have. Because in theory you could use just one signal train to gather all resource on the map including the production of computronium (this would destroy the idea on self-replicating). Also it would be interesting to have a more costly signal train for different resource (one for Si and a different one for Zn) based on some manufacturing idea with the use of other machines.