the trains in my factory have different train lengths. There are 4-10-4 trains, 1-1 trains, 1-2-1 trains and any other combination which comes into my mind.
However, as you can see there is a big train depot designed for the very long trains (4-10-4). This depot should only store the long trains.
That is why I connected all of the depots with a combinator, which sends the following signals:
max train length = 18
min train length = 18
max train number = 2
The problem: the depot is approached not only by the long trains, but also by the short ones. So maximum train signal and minimum train signal do not work properly or I have done something wrong, but I think that this is the right way how to connect them.
Please tell me if something went wrong

Edit: Great, different names work well. Depot-1 for short trains, Depot-18 for long trains. Thx