New players never buy enough vehicles for their lines, so they struggle to make $$ with a handful of horses :) Instead, spend some money on more horses on, for example, that crude-refinery/port route. The Oil well can output 400 units. Keep adding vehicles until the LINE RATE on the route is around 400 = maximum return for your buck! :) Then apply similar logic to other routes - ie stone = 100 units initially then up to 400 as conmat plant expands, farm = 200, logs/coal/ore = always 400. The line rate on the production factories varies according to the DEMAND shown in the consumers tab for that factory... eg conmat plant - demand = the total of how much each TOWN you are shipping to wants :) Clear as mud? Cheers mate!

Vehicle condition is a metric NOT worth worrying about. It only costs you money, with no real benefit other than appearance! Except on those vehicles that run through TOWNS - ie busses - where their NOISE emissions might upset the residents which could lead to lower town growth rate. In other words LOL save your money!