Ann Arbor Railroad Interlocking Plants

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Table of Interlocking points for Ann Arbor Railroad

Interlocking Principles Railway: History, Signaling, Engineering Railroad signals basics timeline

Ottawa Crossing - Michigan Central (Belt line)

At the crossing of the M. C. R. R. at Ottawa Crossing, trains are governed by interlocker as follows: When the arms of semaphore are in a horizontal position, or a red light is shown, danger is indicated, and derailing switch at home signal is open. When the arms of semaphone are in a diagonal position, or white light is shown at night, trains may proceed without stopping for crossing. Trains approaching crossing will not pass distant distant signal faster than four miles per hour. [Central Terminal TT 8 8-7-1898]
Drawing for this crossing point

Manhattan Junction -

At the crossing of the W. & L. E. at Manhattan Junction - when placed vertically T. A. A. & N. M. trains will pass; when horizontally, W. & L. E. trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Manhattan Plant Area - Sanborn Map 1890 era - Ann Arbor in Blue, Toledo and Michigan Belt in Red, Wheeling & Lake Erie in Black
Manhattan Plant - Ann Arbor; Wheeling & Lake Erie; Pennsylvania, Ohio & Detroit; Manufacturers Railroad

Boulevard - 'AX' -Toledo Railroad and Terminal Company tower

Hallett - 'XN' - Ann Arbor; Michigan Central; Pere Marquette; Pennsylvania; Toledo Terminal railroads

Alexis - 'N' -

At the crossing of the Michigan Central and L. S. & M. S. at Alexis Junction - when placed vertically T. A. A. & N. M. trains will pass; when horizontally, Michigan Central and L. S. & M. S. trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Alexis_Interlocking Undated map - Ann Arbor; Michigan Central; Lake Shore and Michigan Southern; Detroit, Monroe and Toledo Electric Railroads [1900-1932]

Federman (Monroe Junction) -

At the crossing of the L. S. & M. S. Railway at Monroe Junction - when placed vertically T. A. A. & N. M. trains will pass; when horizontally, L. S. & M. S. trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Drawing of Federman plant

Dundee - 'RN' -

At the crossing of the L. S. & M. S. Railway at Dundee Junction - when placed horizontally T. A. A. & N. M. trains will pass; when vertically, L. S. & M. S. trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Dundee 1st - Detroit & Lima Northern; Detroit, Toledo & Milwaukee; Ann Arbor Railroads 1899
Photograph of above interlocking tower

Milan - 'MI' - Wabash tower

At the crossing of the Wabash Railway at Milan Junction - when placed horizontally T. A. A. & N. M. trains will pass; when vertically, Wabash trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Milan 1st - Wabash and Ann Arbor Railroads 1899
Photograph of above interlocking tower and depot

Pittsfield -

At the crossing of the L. S. & M. S. Railway at Pittsfield Junction - when placed horizontally T. A. A. & N. M. trains will pass; when vertically, L. S. & M. S. trains will pass; when diagonally, no trains will pass. [TT 4 8-21-1892]
Pittsfield proposed 1898 by Ann Arbor R.R. crossing Lake Shore & Michigan Southern ( Pittsfield Junction )

Lakeland ( Hamburg Junction ) - 'HU' -

Ann Pere ( Howell Junction ) - 'HO' -

At the crossing of the D. L. & N. at Howell Junction - See rule governing Interlockers. [Rules Interlockers 1]
Drawing of know right of ways for the Ann Arbor Railroad - three routes are know
Howell Junction 1st interlock plant proposed 1896 - original crossing was a underpass (D&LN - Detroit & Lansing Northern) (AA - Ann Arbor)
Photographs of Annpere Interlocking Tower

Durand - 'BY' -

At the crossing of C. & G. T. and D. G. H. & M. - Enginemen will blow four short blasts of whistle after coming to full stop, and will not proceed until danger signal at crossing is lowered. [TT 4 8-21-1892]
D. G. H. & M., G. T. W., G. T. "Y" are governor by gates [TT 99 4-26-1925]

Owosso Junction - 'SW' -

Michigan Central at Owosso Junction - T. A. A. & N. M. trains will cross when semaphore is turned parallel to T. A. A. & N. M. tracks. [TT 4 8-21-1892]
M.C. Interchange track, when target is horizontal A. A. trains may pass. M. C. main track, when target parallels A. A. main track, or white light is shown at night, A. A. trains may pass. [TT 99 4-26-1925]
Michigan United Traction Company had diamond across the Ann Arbor Railroad at or near [1] Corunna Avenue and Smith Street, [2] Corunna Avenue and Oakdale Street, in [3] Washington Street crossing.
Map of Junction with Grand Trunk Western - was original connecting point for the Toledo, Ann Arbor & North Michigan for the northern divison. Begining of running rights for the Toledo, Saginaw and Muskegon Railway to Ashley [later GTW].

Alma - 'DG' -

At crossing of S. V. & St. L. R. R. - When the target is placed horizontally, S. V. & St. L. trains will pass; when vertically T. A. A. & N. M. trains will pass; when placed diagonally, no trains will pass. [TT 4 8-21-1892]
P. M. main track and spur east of passenger station, when target is vertical A. A. trains may pass [TT 99 4-26-1925]
Drawing of Interlocking plant [Ann Arbor RR; Pere Marquette RR]

St. Louis - original main line from Ithaca going north

Crossing of St. Louis and Saginaw Valley RR and Toledo, Ann Arbor & North Michigan map

Mount Pleasant - 'MS' -

The Saginaw & Mount Pleasant RR [PM - CO - CSX] tracks and the Ann Arbor RR industries trackage jointed to form the area know as the 'HUB' there was no interlocking plant - MAP

Clare - 'B' -

At crossing of the F. & P. M. at Clare - See rule governing Interlockers [Rules Interlockers 1]
Drawing of Interlocking plant 1920 - 1940 era

Marion Mile post 208.8 'MN'

Junction with Manistee & Grand Rapids [Michigan East & West] 1907 – 1915

Cadillac - `CN' - Mile post 226.5

At crossing of the G. R. & I. at Cadillac - See rule governing Interlockers [Rules Interlockers 1]
Cadillac tower crossing Grand Rapids & Indiana (PRR), Fire 1-24-1926, Changed mechanical to electrical operation 5-1962, Removed diamond 5-1969
All trains will stop at crossing of G. R. & I. leading to Cummer's Lumber Yards, 1/4 mile north of Cadillac station, and not proceed until gate is property set. [TT 4 8-21-1892]
Murphy & Diggins, Cummer & Diggins, G. R. & I. spur are governor by gates [TT 99 4-26-1925]
All trains will come to a full stop before crossing the Cadillac & North-Eastern spur, 1 mile north of Cadillac station, and not proceed until gate is properly set.

Copemish - 'CO' - Mile post 267.58

At crossing of the M. & N. E. Railroad at Copemish - Position of Gate will incidate right to pass. [TT 4 8-21-1892]
M. N. E. crossing is governor by gates [TT 99 4-26-1925]

Thompsonville - 'MO' - Mile post 270.39

INTERLOCKERS.

[Rules Interlockers 1]
[TT 4 8-21-1892]

At crossing of D. L. & N. at Howell Junction, F. & P. M. at Clare, G. R. & I. at Cadillac, and the C. & W. M. at Thompsonville, when the arms of semaphore are in a horizontal position, or a red light is shown, danger is indicated and derailing switch at home signal is open. When the arms of semaphore are in a diagonal position, or white light shown at night, trains may proceed without stopping for crossing. Trains approaching crossing will not pass distance signal faster than for (4) miles per hour.

Note:	Target men will not set the target for an engine to cross until it comes to a full stop.
	Crossings will be kept blocked by signal men at all time except when trains are using them.
	The tracks of the Central Terminal include all Tracks between the F. & P. M. switch, one hundred feet north of L. S. & M. S. crossing at Alexis, and Central Staion at Toledo; also between Ottawa Crossing and bridge No. 1 at north end of Pennsylvania Co.'s Yard.
	Half interlocker was installed in City of Ann Arbor on Huron Street before tracks were raised for crossing of street car line.

Henry F. Burger 11-18-2008, 12-2-2008, 8-4-2009

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