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| Re: 190 St. - Overlook Terrace station question (1641057) | |||
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Re: 190 St. - Overlook Terrace station question |
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Posted by gbs on Tue Apr 29 22:20:24 2025, in response to Re: 190 St. - Overlook Terrace station question, posted by Wallyhorse on Tue Apr 29 14:31:31 2025. The #1 tracks and the A tracks handle the hilly terrain of northern Manhattan very differently. When the original IRT was built in the early 1900s, the motors in the trucks weren't very powerful, so the designers made the tracks as level as possible. So north of 116 St, while the terrain slopes down into the 125 St valley and then slopes back up again, the #1 tracks remain level, becoming elevated at the 125 St station on the arch. Continuing north, as the ground rises to 191 St, the #1 remains level and the stations get deeper. Eventually, the Fort George hill ends sharply, and the #1 pierces through the cliffside and becomes elevated again, remaining virtually level throughout. (Note that the stone above the tunnel portal says "Fort George" and "1776 1905".)  When the IND was built about 30 years later, the motors were more powerful and could handle the hills, so under St Nicholas Avenue, north of 135 St the terrain rises up to Sugar Hill and beyond, and the A tracks rise as well, all cut-and-cover, even at 168 St. North of 181 St, even though Fort Washington Avenue continues to rise, the A tracks, deep bore, start to dip, because when the Fort Washington hill ends at Dyckman St, the A is still underground, but close to the surface and cut-and-cover. |
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