The Galveston Harrisburg & San Antonio Railroad was served by these interlocker towers in Texas:
| A |
Galveston (Galveston Wharves) |
GC&SF, GH&SA, GH&H |
M |
1898 |
|
| Located at 36th Street |
| 2 |
San Antonio |
GH&SA, SA&AP |
M |
10/9/1902 |
1926 |
| Consolidated into Tower 112 |
| 3 |
Flatonia |
GH&SA, SA&AP |
M |
10/9/1902 |
1996 |
| Preserved in Flatonia as part of Flatonia Rail Park |
| 6 |
El Paso (Union Depot) |
GH&SA, EP&SW |
M |
1/23/1903 |
1950 |
| Consolidated into Tower 196 in 1950 |
| 12 |
Houston (Blodgett) |
GH&SA, SA&AP |
E |
7/4/1903 |
1915 |
|
| 14 |
Houston (Chaney Junction) |
GH&SA, H&TC |
E |
7/15/1903 |
|
|
| 17 |
Rosenberg |
GC&SF, GH&SA |
E |
7/23/1903 |
2/10/2004 |
| Last traditional operating tower in Texas; in operation until February 10, 2004. Moved to and preserved at Rosenburg Railroad Museum. |
| 30 |
Harrisburg |
GH&SA, GH&H, PTA |
M |
12/31/1903 |
|
| Also known as "Katy Neck" |
| 33 |
Bay City |
GH&SA, CB |
E |
2/18/1904 |
1954 |
|
| 38 |
Galveston |
GC&SF, GH&SA, GH&H |
E |
5/16/1904 |
|
| Located at 49th street; also known as the "Z-Track" tower |
| 40 |
Luling |
GH&SA, SA&AP |
M |
6/20/1904 |
1931 |
| Moved a short distance from its original location and modified to serve as a gas station |
| 47 |
El Paso |
T&P, GH&SA, EP&SW |
M |
7/11/1904 |
|
| Still standing in its original location |
| 66 |
El Paso (Union Depot) |
GH&SA, EP&SW |
|
11/8/1906 |
1928 |
| Consolidated into Tower 6 in 1928 |
| 68 |
Houston (Englewood Yard) |
GH&SA, T&NO |
M |
3/3/1907 |
|
| Still standing in its original location |
| 73 |
Texas City (Texas City Junction) |
GH&SA, GH&H |
M |
2/18/1907 |
|
|
| 81 |
Houston (T&NO Junction) |
GC&SF, GH&SA |
M |
5/7/1910 |
|
|
| 86 |
Houston (Magers) |
GH&SA, HB&T |
E |
3/18/1912 |
|
| Consolidated into Tower 199 |
| 89 |
Houston |
GC&SF, GH&SA |
M |
1912 |
1918 |
| Mysterious tower that may have never existed; Tower 139 served in its place |
| 90 |
Victoria |
StLB&M, GH&SA |
M |
1/3/1913 |
1972 |
|
| 96 |
Galveston (Island-Causeway) |
GC&SF, GH&SA, GH&H |
E |
9/6/1912 |
|
|
| 97 |
Galveston (Lift Bridge-Causeway) |
GC&SF, GH&SA, GH&H, GHE |
E |
10/23/1912 |
|
| The only interlocking tower still in operation. Unusual arrangement as it controls two railroad lines and a boat channel |
| 98 |
Virginia Point (Causeway) |
GC&SF, GH&SA, GH&H, GHE |
P |
10/14/1912 |
|
|
| 99 |
Galveston (Galveston Terminal) |
GH&SA |
E |
4/29/1914 |
1915 |
| Incosistent records indicate that this tower may have been in operation for only 5 months. |
| 102 |
Houston (Magnolia Park) |
GH&SA, I-GN |
C |
3/31/1915 |
1963 |
|
| 104 |
Houston (Bellaire Junction) |
GH&SA, H&TC, SA&AP |
|
11/1/1915 |
1926 |
|
| 105 |
San Antonio |
GH&SA, I-GN |
M |
4/29/1916 |
|
|
| 112 |
San Antonio |
GH&SA, SAB&T |
E |
12/30/1919 |
|
|
| 114 |
Sugar Land |
GH&SA, SL |
M |
10/25/1923 |
1990 |
|
| 115 |
Eagle Lake |
GH&SA, CB, SA&AP |
E |
7/22/1924 |
1990 |
|
| 121 |
San Antonio (East Yard) |
GH&SA |
E |
4/10/1925 |
2/27/2001 |
| Destroyed by arson's fire, January 16, 2003 |
| 134 |
Houston (Pierce Junction) |
GH&SA, I-GN |
C |
3/27/1929 |
|
|
| 152 |
Wharton |
GC&SF, GH&SA |
C |
7/5/1929 |
1984 |
| Cabin-type interlocker still in place |
| 156 |
Allenhurst |
StLB&M, GH&SA |
C |
8/2/1929 |
9/26/1932 |
| Possibly the shortest-lived tower, operational for 2 to 3 years |
| 157 |
Blessing |
StLB&M, GH&SA |
C |
8/27/1929 |
1985 |
|
| 158 |
Placedo |
StLB&M, GH&SA |
C |
10/1/1929 |
|
|