Ann Arbor Railroad Interlocking Plants
Table of Interlocking points for Ann Arbor Railroad
Interlocking Principles Railway: History, Signaling, Engineering Railroad signals basics timeline
Ottawa Crossing - Michigan Central (Belt line) controlled from Manhattan tower
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]
Manhattan Junction - (Wheeling & Lake Erie tower)
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]
Plant - Ann Arbor; Wheeling & Lake Erie; Pennsylvania, Ohio &
Detroit; Manufacturers Railroad
As of 2016 the Ann Arbor RR – WACO is switching all the trackage of the W&LS and PRR on its side of the river.
Boulevard - 'AX' -(Toledo Railroad and Terminal Company tower)
Hallett - 'XN' - Ann Arbor; Michigan Central; Pere Marquette; Pennsylvania; Toledo Terminal railroads
Alexis - 'N' - (Michigan Central, Michigan Southern & Lake Shore Tower)
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) - [The station is used for the train ride at Momroe County Fair grounds]
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
Diann - 'MX' - (Detroit, Toledo & Ironton Tower)
While cut-off was being constructucted as set of crash boards protected the crosssing.
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]
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]
Original called Ypsilanti Junction 7-29-1878 Public timetable, changed to Pittsfield Junctionby 6-22-1884 Public timetable
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]
Penn Central instruction from
Timetable No. 1 April 28, 1968
STOP. Proceed indication -- Derails in non-derailing positions. Derails are time-locked. Permission must be obtained from Ann Arbor RR before operating lock. Normal position for derails is for Ann Arbor R. R.
Stop gates installed and interlocking plant removed from service along with signals by 8/7/2015
South Lyon - 1880s
A junction point and interchange with the Detroit, Lansing and Northern also with Michigan Air Line Division of the Grand Trunk Railroad.
Drawing of junction point with Detroit, Lansing and Northern (Michigan Air Line Railroad drawing)
Hamburg - Michigan Air Line depot
Connecting track to Michigan Air Line Railroad, originally used for interchange and to get trains to Hamburg Junction (Lakeland area.) This drawing shows after Lakeland trackage build, interchange still in place.
Lakeland ( Hamburg Junction ) - 'HU' -
Ann Pere ( Howell Junction ) - 'HO' -
In the case of Toledo, A. A. & N. M. Ry. Co. vs Detroit, L. & N. R. R. Co., 62 Mich., 564, the objections to the petition held well taken were:
That it showed no effort to obtain the property by agreement, before taking steps to condemn.
That it sought to obtain greater rights than the law allows to be condemned
That it did not properly describe the property sought to be condemned
Pinckney Dispatch December 8, 1887 -- The memory of the famous “Howell Railroad war” is still green in the hearts of many Michigan people. The Toledo & Ann Arbor Co. cut under the track of the Detroit, Lansing & Northern near Howell and a the work was done to suit the latter company a row ensued that resulted in the stoppage of trains, tearing up the tracks and lots of lawsuits. Later, the managers of the two roads got to a better understanding of each other, and it was decided to put a good bridge at the crossing. This work was begun this fall and pushed to the fullest extent and at great cost, but it has now been found that it is impossible to complete the work owing to water and quicksand. Now the Toledo & Ann Arbor folks have changed the route of their road and cross the other road at grade nearer to Howell. An interlocking switch is to be put in so that trains can pass without stopping. It has been a costly bit of engineering.[Brighton Argus]
At the crossing of the D. L. & N. at Howell Junction - See rule governing Interlockers. [Rules Interlockers 1]
Howell Junction 1st interlock plant proposed 1896 - original crossing was a underpass (D&LN - Detroit & Lansing Northern [over]) (AA - Ann Arbor [under])
Photographs of Annpere Interlocking Tower second tower, first burned with depot
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]
Penn Central Timetable No. 1 April
Saginaw branch - Color light target - Green light - STOP - Proceed indication -- Green light. Normal position of signal is for Ann Arbor RR
Saginaw spur track - Target - Target vertical - STOP - Proceed indication -- Target vertical. Nomal position of target is for Ann Arbor RR.
Michigan United Traction Company
had diamond across the Ann Arbor Railroad at or near  Corunna
Avenue and Smith Street,  Corunna Avenue and Oakdale Street, in
 Washington Street crossing.
These crossings used half-interlocking type of protection.
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]
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, the connecting point is a bridge over the creek at the bottom of map2. There was joint use of trackage after CSX abandoned the track going to Mt. Pleasant. - MAP1 MAP2
Clare - 'B' -
At crossing of the F. & P. M. at Clare - See rule governing Interlockers [Rules Interlockers 1]
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, Closed 10/3/1963, 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.
Cadillac Tower closed October 9, 1963
Later State of Michigan removed Pennsyvanlia RR trackage from interlocking plant to throught downtown area leaving yard and leaving trackage north, cconnection to the Ann Arbor was done via the the 'belt line'.
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]
The Arcadia and Betsey River Railroad Junction in the Ann Arbor Railroad just north of Copemish and interchanged cars and turned engines in Copemish.
The Manistee & North Eastern abandoned trackage thru Copemish in early 1930s, the Ann Arbor RR retained the M&NE trackage in Copemish which had customers with service.
The Arcadia and Betsey River abandoned trackage from Henry to Copemish which was leased from Ann Arbor Railroad From 12-12-1896 until 1937, the Ann Arbor RR removed its trackage.
Map of Henry interlock plant in 1900 showing Manistee & North Eastern; Arcadia & Betsey River; Chicago & West Michigan (later PM, C&O) Railroads
Thompsonville - 'MO' - Mile post 270.39
[Rules Interlockers 1]
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.
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