Are your bus lines profitable even in hard difficulty ?
Is it better a single bidirectional line than two circular lines (one per sense of direction) ?
How many stops do you usually place ?
Which usage rate are you able to achieve ?
Just for comparison, in my last game with double circular routes on hard and USA DLC I manage to service around 75-85% of passengers but after the beginning where I made some little profit with the first horse cars, then I started to make a little loss around 20-40K per line with the newer busses. Are you able to achieve better results with your strategy ?