Running trains is a good way to get mixed seeds and diseases.
Since the instant gratification/what have you done for me lately explosion in this hobby/industry has come about,there is very little consideration taken when people trade or pump seeds into these trains. A growing majority of people trade seeds for seeds and don't even grow them. As a lover of plants and growing in general,I cannot wrap my head around it.
You would be better off making friends,viewing GLOGS and seeing who is growing clean and true versions and then start trading. Antiquated and boring but way less stress.