Finding the operating speed

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As part of the California High Speed Rail System, the Caltrain tracks from SJ toSF will be upgraded to support modestly higher speeds. A key question is whatspeed should they be upgraded to. The current speed (80 mph) is unacceptablyslow, but the top speed of the trains (220 mph) may not be appropriate for adense urban/suburban area. Suppose that train ridership isP= 100S, wherePis total daily ridership (passengers) andSis the speed that the train will runat (mph). Suppose that operating at speed S costsC= 100S+ 5S2(note that this cost is independent of the number of passengers that ride). Further supposethat each passenger that rides has a willingness to pay equal to the train fareand that each passenger saves other highway commuters $5 in congestion costsand reduces pollution externalities by $1. Finally, suppose that higher speedscreate more noise for houses located next to the tracks, and that the total costof this noise isN= $S2.

Caltrain is currently in the process of converting from diesel locomotivesto electrification. Electric trains are faster and have no (local) emissions.Assume that the electric trains will reduce pollution externalities by $2 perride (vs $1) and change operating costs toC= 50S+4S2. What operating speed with Caltrain choose with electric trains (assuming it takes intoaccount all costs and benefits)?

Reference no: EM133078265

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