You may not need that in the early days of your park. You will spend plenty of money if you want to buy enough track to make a closed loop for the Steam Train. Favor those that offer a Shuttle Mode (Monorail) or have a small footprint (Chair Lift) over the Steam Train, which can only travel in one direction and needs room to turn. That said, Transport Rides can get expensive very quickly, so start small with an eye toward expansion. Use the Transport Rides whenever you can.
This guest may get mad about his predicament and resort to vandalism, which will drag your Park Rating down. In the worst-case scenario, a guest can get tired in the back of the park, then fail to find his way out because of his sleepiness. Tired guests don't ride rides, don't buy food or souvenirs, and, worst of all, don't stay in your park. If you operate a medium-sized park, your guests will spend most of their time walking from ride to ride, ride to Bathroom, Food Stall to ride, etc. Many first-time park-builders think of Transport Rides as a luxury, something that only established, older parks offer. A few minutes of planning can prevent unnecessary destruction later. By their very nature, Transport Rides take up a lot of space, so they will need some room. Transport Rides don't become necessary until your park gets fairly big, but you should start thinking about them on day one.