IF YOU THINK THIS ISSUE HAS ALREADY BEEN DISCUSED... You may close this thread.

whenever i couple up any coach to any locomotive this happens:

when i delete the locomotive that i was using this happens:

The IC4 was intentionally disabled due to a number of linking issues from it's size (additionally the model wasn't exactly up to par on quality).
We would have removed it from the creative menu but that would have caused problems in other systems, TC doesn't like things being removed.

Additionally it appears your linked transports go beyond your chunkloaded distance, there's a bug in the recent build that makes the mod fail to force chunkloading, so that's something to keep in mind. (we're at least trying to have that problem fixed in the next release)

this one happened whilst in the chunkloaded distance funnily enough:

Very strange.....
I'll go over the linking code related to the error message and see if i can maybe give it some backup plan if it can't hold the link for whatever reason.

what if the car checked for a engine and if there was not one linked to it, it would apply some type of "emergency" brake? like the train has a air hose connected to a EOT device and if the EOT device gets too far from the engine it would automatically apply the brakes.

that would require a lot more advanced checking and data caching than the mod has, additionally it wouldn't fix the problem. only stop you when it happens.