Specific orders for construction robots

[biterlove]

Hey - I'm currently on a playthrough with rampant on a sparsely resourced world, and I'm having trouble with my trains getting mobbed by biters and limping back to base with some damage. The biter groups are too large for the train to always blast through easily without losing speed. Is it possible (with or without mods) to have a roboport where the construction robots only fix trains? I could just put a stop with a robo port far away thats outside my robot network but it's awfully hard to gain space for my base on this map.

[robot256]

You can't control robots by any means other than the spacing of the roboports and the contents of the logistic network.

For example, you could have near your base a "repair depot" where trains pause inside the range of an isolated robot network. Then they wait for 5 seconds and for all construction robots to be available (idle).

Or, just make bigger trains, or use heavier nodded trains.