Question for panzer campaign stalingrad

[Mr Grumpy]

So lets assume your rail capacity is 10, if you cannot place a unit into rail more then somewhere on the map you have 10 units already in rail mode, if you scroll round you should be able to spot them, remember they might be part of a stack with other units?

To answer your specific ZOC questions you will need to post images, it is impossible to work out what you don't understand from your description.