Explain the main factors affecting the supply of transport services for a transport mode of your choice

I would like talk about rail of transport services.
what are the factors might affect railway,let's see the characteristics of it. At passenger transport side, provide a speedy means of transport over middle to long distance, and into and out of congested cities and towns. Also it can carry large volumes of passengers in an environmentally acceptable way and is able to compete favorably with air on certain domestic routes. At the fright transport side comparative advantage over road for bulk shipments of basic products and for container traffic over longer distance. there are interchange limitations for certain types of potential traffic. Increasingly used fir intra-EU loads. After know these information above that I think infrastructure may affect it, for example if there are some damage of rail, the rail transport services can not operate, also if they meet some natural accident,like coast,Niagara and so on,those accident will stop the rail and it need a long time to fix the rail. In another hand, the factors of economic also can influence it. For example , with the income of people increasing, people may think about to use rail or not, some of them think about maybe rail will be more quickly than other transports services, because their are lower congestion and may lower price, and then they can save more money. Also they may think about, use rail transport services may waste the time, because almost use railway to transport some things need full capacity, if not the cost of railway will increase, so they need to wait, and also there will be some risks, like the natural accidents.So according to the opportunity cost, they may choose use car or another transport services. Also maintain rail, how to operate rail transport will effect it . etc.

I am not sure about my answer is right or not, I tried to understand the question and answer it,Mr Chris can you give me some suggestion.