In conjunction with the opening of the Grinstone Mines Branch, upgrade work was in progress elsewhere on the Hedingbury Division. A second span over the Telow River, this one comprised of a stone viaduct, was completed in the first week of 1895, effectively double-tracking the main line from Hedingbury westward. Only the Tuntown River and a small viaduct to the east remained to be double tracked.
An additional double-track leg was added to the trackwork at Trewell Junction, where the passenger branch line to Trewell and Plonstock Heath branched off from the main line. This project would allow future passenger trains from Telow Central direct access to the newly renamed Trewell Subdivision. Starting in 1895, all divisions on the Tarborough Trunk were given a numeral identifier, and sections of line in each division were further divided into subdivisions with a name and alphanumeric designator for operations and maintenance purposes. This system was implemented at the order of Spike Driver, Superintendent of Maintenance, who needed to be able to identify each component of an increasingly complex rail network.
A similar concept was adopted by the Operating Department, where a few years previously the clairvoyant I.C. da Future had considered adopting a 4-digit code similar to that eventually employed by British Railways. Wanting something far more flexible and intuitive, the Operating Department instead implemented a routing code based on a six-digit identifier with the format XxYyZz.
- Xx was a number designating the originating division (1 = Windchester Division, 2 = Second Division, 3 = Hedingbury Division).
- Yy referred to the cargo type.
- Zz was a unique 2 digit number for each route/service combination.