| | Date | Description | Location | MdHR No | MSA Citation |
| Details | 1881 | George's Creek & Cumberland Railroad, Connection with Baltimore & Ohio Railroad | 01/09/02/005 | 40240-1 | S46-1 |
| Details | 1882 | Baltimore & Ohio Railroad, Curtis Bay Branch of Patapsco River | 01/09/02/005 | 40240-2 | S46-2 |
| Details | 1883 | Baltimore & Ohio Railroad, Philadelphia Branch of Susquehanna River | 01/09/02/005 | 40240-3 | S46-3 |
| Details | 1885 | Annapolis & Baltimore Short Line Railroad, Severn River | 01/09/02/005 | 40240-4 | S46-4 |
| Details | 1886 | Piedmont & Cumberland Railroad, Chesapeake & Ohio Canal | 01/09/02/005 | 40240-5 | S46-5 |
| Details | 1889 | Shenandoah Valley Railroad, Potomac River | 01/09/02/005 | 40240-6 | S46-6 |
| Details | 1889 | Western Maryland Tidewater Railroad, Middle Branch of Patapsco River | 01/09/02/005 | 40240-7 | S46-7 |
| Details | 1890 | Baltimore & Eastern Shore Railroad, Choptank River | 01/09/02/005 | 40240-8 | S46-8 |
| Details | 1890 | Baltimore & Eastern Shore Railroad, Oak Creek | 01/09/02/005 | 40240-9 | S46-9 |
| Details | 1891 | Baltimore & Eastern Shore Railroad, Sinepuxent River | 01/09/02/005 | 40240-10 | S46-10 |
| Details | 1891 | Potomac Valley Railroad, Chesapeake & Ohio Canal | 01/09/02/005 | 40240-11 | S46-11 |
| Details | 1892 | Washington & Chesapeake Beach Railroad, Patuxent River | 01/09/02/005 | 40240-12 | S46-12 |
| Details | 1893 | Baltimore & Ohio Railroad, Chesapeake & Ohio Canal and Potomac River | 01/09/02/006 | 40240-13 | S46-13 |
| Details | 1893 | Baltimore & Ohio Railroad, Chesapeake & Ohio Canal | 01/09/02/006 | 40240-14 | S46-14 |
| Details | 1893 | Baltimore & Cumberland Railroad, Chesapeake & Ohio Canal and Potomac River | 01/09/02/006 | 40240-15 | S46-15 |
| Details | 1893 | Berlin & Lovettsville Bridge Co., Chesapeake & Ohio Canal | 01/09/02/006 | 40240-16 | S46-16 |
| Details | 1894 | Canton, Sparrows Point & North Point Railroad, Colgate Creek | 01/09/02/006 | 40240-17 | S46-17 |
| Details | 1894 | City & Suburban and Canton & Sparrows Point Railroad, Colgate and Bear Creeks | 01/09/02/006 | 40240-18 | S46-18 |
| Details | 1895 | Canton, Sparrows Point & North Point Railroad, Colgate Creek | 01/09/02/006 | 40240-19 | S46-19 |
| Details | 1896 | Queen Anne's Railroad, Choptank River | 01/09/02/006 | 40240-20 | S46-20 |
| Details | 1897 | Baltimore & Ohio Railroad, Curtis Bay Branch of Patapsco River | B5/09/02/000 | 40240-29 | S46-21 |
| Details | 1902 | Dundalk, Sparrows Point & North Point Railroad, Bear Creek | 01/09/02/006 | 40240-21 | S46-22 |
| Details | 1903 | Western Maryland Railroad, Chesapeake & Ohio Canal | 01/09/02/006 | 40240-22-1/2 | S46-23 |
| Details | 1905 | Philadelphia, Baltimore & Washington Railroad, Susquehanna River | 01/09/02/006 | 40240-23 | S46-24 |
| Details | 1907-1908 | Baltimore & Ohio Railroad, Susquehanna River | 01/09/02/006 | 40240-24 | S46-25 |
| Details | 1907 | Norfolk & Western Railroad, Potomac River and Chesapeake & Ohio Canal | 01/09/02/007 | 40240-25 | S46-26 |
| Details | 1913 | Cumberland Valley Railroad, Potomac River | 01/09/02/007 | 40240-26 | S46-27 |
| Details | 1927 | Pennsylvania Railroad, Colgate Creek | B5/09/02/000 | 40240-27 | S46-28 |
| Details | 1935-1937 | Pennsylvania Railroad, Bear Creek | B5/09/02/000 | 40240-28 | S46-29 |
| Details | 1939 | Pennsylvania Railroad, Bear Creek | B5/09/02/000 | 40240-30 | S46-30 |
| Details | 1947 | Pennsylvania Railroad, Back River Branch and Eastern Ave | B5/09/02/000 | 40240-31 | S46-31 |