Yeah I recently did this while switching out an industry off of the mainline, then I used a passing siding to run around the train and grab it from the other end. Unfortunately this is the only way that you can do it as I described it, with disconnecting all the railcars and then reconnecting. I was on flat ground so it wasnt a huge deal as nothing moved, but it definitely breaks the emersion having to do that :/ I am glad you are enjoying it tho! I have plans for another update this weekend!