not sure if this is an incompatibility with the inserter configuring mod im using, or some other mod, or just a bug, but the mini trains do not intake fuel, least from the bottom, tho strangely they intake it from the top no problem? im going to further test this some more, to see how this bug works

further testing has got my head scratching, cuz its only in a very specific circumstance?

it appears to be when you feed fuel into the starting locomotive from the second half, if the locomotive is facing east to west

but, also, if the arm itself is taking from the east and depositing northwards into the second half of the first locomotive

mod for the 90 degree inserters is "inserter configuration", most recent vers for that