I only have three trains but even that has made a some difference when working my neighbors facilities. I don't know if I will purchase more or not. I have sufficient goods since I only have 2-3 people who work my facilities I seldom run out.
I too think it would be nice if they were on the 20 hour day everything else is. I generally unload and reload on Sat but I was busy a couple weeks ago so now it has been changed to Sunday. With the 20 hour FarmTown day I could have kept my regular Saturday schedule.