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| Re: VIDEOS: BALTIMORE METRO SUBWAY (1636122) | |||
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Re: VIDEOS: BALTIMORE METRO SUBWAY |
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Posted by Sand Box John on Thu Sep 26 01:55:43 2024, in response to Re: VIDEOS: BALTIMORE METRO SUBWAY, posted by Jersey Mike on Wed Sep 18 07:53:47 2024. Makes sense, but also puzzling since #15's are the standard size and also if they cared so much about terminal capacity they should have put the crossover closer to the platform as that distance sets the minimum possible headway.The curve beyond the inbound end of the station platform makes placing those crossovers closer impractical. The 2 crossovers are longer then the curve. There also is the issue of the reduction of the track centers in the curve. Most heavy rail transit systems built anew during the second half of the last century use #10 in their terminal interlockings with the points of the turnouts no more then 2 car length from the inbound end of the platform. Terminal capacity headway is a wash because moves through #15 can be done at a higher speed then #10. The interlocking can be cleared and reset allowing the inbound train to depart before the outbound train berths at the platform. Had the Baltimore Metro been fully built out, 3:00 headways would have likely been the norm during peak, typical peak headways today are more then twice that. |
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