The Dundas Subdivision has as it's orgin four railways:
| Date | Event |
|---|---|
| 1853-12-17 | GWR operates first through train from Niagara Falls via Hamilton to London[Stevens-1960, p. 106]. |
| 1853-12-21 | GWR opens Hamilton to London[Churcher]. |
| 1854-03-06 | BB&GR establishes regular service between Brantford and Paris [Stevens-1960, p. 471]. |
| 1854-11-01 | BB&GR opens between Fort Erie and Paris[Trout-1970, p. 35]. |
| 1856-05-16 | BB&GR becomes the B&LHR[Stevens-1960, p. 473]. |
| 1858-06-28 | GTR leases B&LHR[Stevens-1960, p. 475]. |
| 1871c | H&BR proposes to construct a line from the GWR east of Harrisburg to Brantford by way of Alford[Trout-1970, p. 166]. |
| 1871-11-23 | GWR formally opens branch from Harrisburg to Brantford[The Globe (Toronto), November 24, 1871]. |
| 1882-08-12 | GWR and GTR amalgamate[Bowers-1983, pp. 19 & 162, Cooper-2001, p. 394]. |
| 1905-09-30 | GTR officially opens new "cut-off" between Lynden and Alford and opens mainline via Brantford[The Globe (Toronto), Monday, October 2, 1905, pp. 1 & 3]. |
| 1923-01-31 | GTR becomes part of CNR[Bowers-1983, p. 162, Cooper-2001, p. 394]. |
| 1928-03-03 | Railway Age announces that Union Switch & Signal will supply materials for installation of Automatic Block Signalling using colour light signals between London and Ingersoll[Railway Age, 84(9) 1928-03-03, p. 550]. |
None.