RandstadRail

Line E (formerly Erasmuslijn) is a metro line, which also belongs to the Rotterdam Metro network. For a great part, it runs on the former Hofpleinlijn railway line between Den Haag Centraal railway station and Rotterdam Hofplein railway station.[4] After the train services had been discontinued, the track was re-opened as a RandstadRail line in September 2006, running between Nootdorp and Hofplein.[5] In November 2006, the line was extended to The Hague.

As part of the line's conversion to RandstadRail operation, it began using RET metro trains, and more stops were added and train frequencies increased. Although the conversion had not been flawless, with a series of technical problems and a derailment, the line has been in full operation since September 2007.

In 2010, Hofplein terminus was replaced with the Statenwegtracé, a bored tunnel connecting the line with the local metro network at Rotterdam Centraal railway station.[5] In December 2011, the line was further extended to Slinge metro station in the south of Rotterdam, sharing the section between Rotterdam Centraal and Slinge with the already existing line D.[2][5]

The RandstadRail network originally included two tram-train lines: line 3 between Loosduinen and Zoetermeer Centrum-West, and line 4 between De Uithof and Lansingerland-Zoetermeer.[2] On 23 July 2020, a third tram-train line was added to the network: line 34, which serves as a combination of lines 3 and 4, connecting Loosduinen to Lansingerland-Zoetermeer railway station.[6]

West of Den Haag Centraal railway station, these lines are operated as regular street-running tram lines, partially interlined with the local network and passing through the Haagse tramtunnel, a 1.25 km (0.78 mi) tunnel under the Grote Marktstraat in the city centre. Between Den Haag Centraal and Zoetermeer, they operate on dedicated tracks as a light rail system. The section from Den Haag Centraal to Laan van NOI is elevated on a viaduct. From Laan van NOI to Leidschenveen, the lines share the track and stations with line E.

East of Leidschenveen, line 3 follows the same route as the former Zoetermeer Stadslijn, while lines 4 and 34 branch off towards Oosterheem after Seghwaert station.[2] In 2019, the Oosterheem branch was extended from Javalaan to Lansingerland-Zoetermeer.[7]

In December 2012, two bus lines were added to the network.[8] These so-called "ZoRo" buses run between Zoetermeer and Rodenrijs RandstadRail station, where they connect with RandstadRail line E. A new bus lane was constructed for the project.[1][8] The buses are operated by RET and have an almost instant connection to arriving metros at Rodenrijs station. At the termini in Zoetermeer, the ZoRo buses connect with regional bus lines (Arriva and Veolia Transport) and RandstadRail lines 3, 4 and 34.

Despite not being a part of the RandstadRail network, lines 2 and 19 of HTM's local tram network make use of RandstadRail-liveried RegioCitadis vehicles in addition to the regular Siemens Avenio trams.[3] For line 19, this is necessary as it lacks balloon loops at its termini, meaning that the uni-directional GTL8 vehicles cannot be used on this route. Since 2015, the rolling stock of line 2 has been gradually replaced by Avenio vehicles.