What is the average round trip time for a route?
From the above, an average round trip on our average route would take 18 x 4 x 2 = 2hr 24mins. Allowing some time at the terminal, an average round trip might take 2hrs 30mins. Question 5: How frequently do trains stop at each station? Train frequencies at busy, central stations are every 2-3 minutes, often due to overlapping routes. Further out train frequencies can be as low as every 15 minutes on some routes Again, this estimate would be based on your own experiences. A reasonable approximation for train frequency on a single route would be somewhere between the two. We assume every 7.5 minutes (equivalent to 8 trains per hour) during peak time. Question 6: How many trains are required on an average route? To maintain a frequency of 8 trains per hour (given that the time taken for one round trip is 2 hrs 30 mins) would require 20 trains on each route (i.e. 8+8+8/2 ) Question 7: How many trains on the underground? There are 25 routes and 20 trains per route, so a very approximate fig
